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Smart­phones dif­fer not only exter­nal­ly, but also inter­nal com­po­nents. In today’s arti­cle we deal with the main char­ac­ter­is­tics. Pho­to: Julian Chokkattu/Digital Trends

When choos­ing a smart­phone, many buy­ers for­mu­late gen­er­al require­ments — a good cam­era, a high-qual­i­ty dis­play, long bat­tery life, a pow­er­ful proces­sor. But how to eval­u­ate how good this or that para­me­ter is? In today’s arti­cle, we talk about the main char­ac­ter­is­tics of smart­phones, know­ing which you can eas­i­ly under­stand the num­bers and terms.

Display

In the list of char­ac­ter­is­tics, man­u­fac­tur­ers usu­al­ly indi­cate the type of pan­el used, res­o­lu­tion, aspect ratio, pix­el den­si­ty and refresh rate. Let’s dwell on each para­me­ter in more detail.

Panel type

Mod­ern smart­phones main­ly use LCD or OLED matri­ces. Oth­er pan­els are vari­a­tions or mar­ket­ing names. LCD uses liq­uid sil­i­con crys­tals to trans­mit images (LCD stands for Liq­uid Crys­tal Dis­play, which trans­lates as “liq­uid crys­tal dis­play”), OLED uses organ­ic light-emit­ting diodes (OLED — Organ­ic Light-Emit­ting Diode — “organ­ic light-emit­ting diode”).

Pre­vi­ous­ly, both types of matri­ces were pas­sive, which neg­a­tive­ly affect­ed bat­tery con­sump­tion. To change the sit­u­a­tion, they were sup­ple­ment­ed with thin film tran­sis­tors (TFT — Thin film tran­sis­tor) to dri­ve crys­tals or LEDs. Mod­ern LCD-based active matri­ces are called IPS, and AMOLED dis­plays are the mar­ket­ing vari­ety of OLED.

The main dif­fer­ence between IPS and OLED matri­ces is the glow. In the first crys­tals are placed in the same plane par­al­lel to the screen, under them there is a spe­cial lay­er with back­light. The sec­ond does not require addi­tion­al illu­mi­na­tion, since the diodes them­selves are light sources. For exam­ple, Realme C35, VIVO Y33s, TECNO Camon 18P use IPS LCD pan­els, while Poco X4 Pro 5G and Huawei Nova 8 use OLED pan­els.

Both IPS and OLED pan­els have their pros and cons. In the pho­to above, Xiao­mi Poco M4 Pro 5G with IPS LCD screen. Pho­to: www.gsmarena.com

IPS pros:

  • they are cheap­er, thanks to this, even in inex­pen­sive smart­phones you can install a high-qual­i­ty IPS dis­play; low cost to replace a bro­ken screen;
  • pro­vide bet­ter image clar­i­ty at a low­er pix­el den­si­ty;
  • have accu­rate col­or repro­duc­tion and pure white col­or;
  • work for a long time — even after 5 years of inten­sive loads, the bright­ness of IPS dis­plays does not decrease;
  • do not cause dis­com­fort to the eyes.

Cons of IPS:

  • black col­ors have a gray tint due to addi­tion­al back­light­ing;
  • low­er con­trast;
  • drain the bat­tery faster;
  • low­er response time.

LTPS is a mod­i­fied ver­sion of IPS that has solved some of the above prob­lems. It uses low-tem­per­a­ture poly­crys­talline sil­i­con. This makes LTPS screens 2x faster in response to taps and con­sumes less bat­tery than IPS screens. How­ev­er, their cost is high­er.

Pros of OLED:

  • deep black col­or;
  • high sat­u­ra­tion and con­trast;
  • con­sume the bat­tery more slow­ly;
  • sup­port for the always-on screen mode;
  • thin­ner matrix (affects the size of the smart­phone);
  • faster response to press­ing (impor­tant in games);
  • the pos­si­bil­i­ty of pro­duc­ing curved and flex­i­ble pan­els.

Cons of OLED:

  • screen fades over time. The ser­vice life depends on the qual­i­ty of the pan­el, the active screen time, the bright­ness set and the always-on screen mode acti­vat­ed. High-qual­i­ty dis­plays can last at least 2.7 years with con­stant use. Man­u­fac­tur­ers rec­om­mend chang­ing the back­ground image peri­od­i­cal­ly to pro­long the life of the dis­play;
  • over time, col­or repro­duc­tion dete­ri­o­rates (yel­low­ness appears), ser­vice life is sim­i­lar to that indi­cat­ed above;
  • the clar­i­ty of the image is reduced;
  • you will have to pay more for a screen replace­ment;
  • more sen­si­tive to mois­ture, since there is no air gap between the matrix and the touch­screen;
  • due to PWM (“Pulse Width Mod­u­la­tion”, dis­play flick­er), eyes get tired.

Super AMOLED, Dynam­ic AMOLED — pan­els man­u­fac­tured by Sam­sung. Accord­ing to the man­u­fac­tur­er, these are improved OLED matri­ces. In par­tic­u­lar, the com­pa­ny has changed the loca­tion and reduced the num­ber of blue pix­els that adverse­ly affect vision. For exam­ple, the Sam­sung Galaxy A73 5G uses a matrix called Super AMOLED Plus.

Reti­na dis­plays, found in iPhone smart­phones, are the mar­ket­ing name for pan­els with increased pix­el den­si­ty per inch. At the same time, Apple uses both tech­nolo­gies: before the iPhone X, only IPS, the cur­rent flag­ships are AMOLED. For exam­ple, the Apple iPhone 11 has a Liq­uid Reti­na IPS LCD pan­el, while the iPhone 11 Pro Max and iPhone 13 have Super Reti­na XDR OLED.

Permission

The clar­i­ty and uni­for­mi­ty of the image depends on this para­me­ter. How­ev­er, it is impor­tant to con­sid­er the diag­o­nal — a large dis­play with a low res­o­lu­tion, the image will be loose and grainy. For phones up to 5.5 inch­es, HD res­o­lu­tion (1280 x 720 pix­els) was suf­fi­cient. Mod­ern flag­ship smart­phones have high res­o­lu­tion. For exam­ple, the 6.73-inch screen of the Xiao­mi 12 Pro is 1440 x 3200 pix­els.

Keep in mind, the high­er the dis­play res­o­lu­tion, the faster the bat­tery drains.

Aspect Ratio

Most smart­phones that hit the mar­ket get widescreen dis­plays with 20:9 aspect ratio (Poco F4, Sam­sung Galaxy A13) or 21:9 (Sony Xpe­ria 1, Xpe­ria 10). The use of elon­gat­ed pan­els with nar­row bezels allows larg­er dis­plays to fit into stan­dard phone sizes. For exam­ple, the Apple iPhone 8 Plus with a 5.5‑inch 16:9 aspect ratio dis­play is larg­er than the Apple iPhone 13 (6.1 inch­es, 19.5:9 aspect ratio): 158.4 x 78.1 x 7.5 mm vs. 146.7 x 71.5 x 7.7 mm.

Pixel Density

The Sam­sung Galaxy S22 Ultra 5G has a Dynam­ic AMOLED 2X dis­play with a den­si­ty of 500 ppi. Pho­to: www.gsmarena.com

This indi­ca­tor is mea­sured in ppi (points per inch, dots per inch). The high­er it is, the bet­ter the pic­ture qual­i­ty. With a low pix­el den­si­ty, the user has to strain their eyes due to a blur­ry pic­ture. In mod­ern even bud­get smart­phones, dis­plays have a den­si­ty of about 300 ppi or slight­ly less (for Itel Vision 3 Plus — 263 ppi). High-end devices get screens with high pix­el den­si­ty, such as the Sam­sung Galaxy S22 Ultra 5G ~500 ppi.

Update frequency

The high refresh rate ensures a smooth pic­ture when play­ing games. For exam­ple, the Black Shark 4’s Super AMOLED pan­el has a refresh rate of up to 144Hz. Pho­to: www.gsmarena.com

Or the num­ber of frames per sec­ond that is dis­played. The high­er, the smoother the pic­ture. The stan­dard val­ue is 60 Hz, it is enough for watch­ing movies. High refresh rate dis­plays pro­vide smoother scrolling and in-game visu­als. Now there are smart­phones on the mar­ket that sup­port refresh rates of 90 (Xiao­mi Red­mi Note 11), 120 (One­Plus 9) and even 144 (Black Shark 4) Hz.

CPU

Oth­er names are mobile plat­form, sin­gle-chip sys­tem, SoC or chipset. This set­ting affects the speed of the device.

The main char­ac­ter­is­tics of a mobile proces­sor are the num­ber of cores, their clock fre­quen­cy and the man­u­fac­tur­ing process.

Number of Cores

Each core installed in the chipset han­dles 1 task thread. The more cores, the more threads the proces­sor exe­cutes and the high­er its per­for­mance.

Almost all smart­phones on the mar­ket have octa-core proces­sors (the excep­tion is the iPhone with 6 cores). How­ev­er, not all cores are equal in per­for­mance. SoC brands place cores in one, two or three clus­ters to increase bat­tery life. They are used to solve var­i­ous prob­lems:

  • to per­form sim­ple com­mands (voice calls, brows­ing sites, play­ing videos) less pow­er­ful, but more ener­gy effi­cient cores;
  • for gam­ing, neur­al net­works or video edit­ing — pow­er­ful.

Most often, the cores are divid­ed into 2 clus­ters — in one pro­duc­tive, in the oth­er — ener­gy effi­cient. Depend­ing on the sce­nario, cores from a sep­a­rate clus­ter are used. This allows you to opti­mal­ly con­sume the bat­tery and per­form tasks effi­cient­ly.

Clock frequency

This is the main indi­ca­tor that affects the per­for­mance of the ker­nel. Mea­sured in MHz or GHz. The high­er the val­ue, the high­er the pow­er.

The cores do not con­stant­ly oper­ate at peak fre­quen­cy, they adapt to the sit­u­a­tion. For exam­ple, dur­ing games, the mobile plat­form can oper­ate at a fre­quen­cy of 2.5 GHz or high­er, and when surf­ing the web, it can drop to 300 MHz.

Process technology

Apple iPhone 13 Pro is based on the pro­pri­etary A15 Bion­ic proces­sor, man­u­fac­tured using a 5‑nm process tech­nol­o­gy and hav­ing 6 cores (2 at 3.23 GHz and 4 at 1.82 GHz) Pho­to: gsmarena.com

It is mea­sured in nanome­ters (nm) and indi­cates the size of each tran­sis­tor. The small­er the tran­sis­tor, the more you can install on the proces­sor and there­by increase the over­all per­for­mance. Com­pact tran­sis­tors accu­mu­late less heat and drain the bat­tery more slow­ly.

The flag­ships of 2022 are based on sin­gle-chip sys­tems man­u­fac­tured using a 5 or 7 nm process tech­nol­o­gy. Mid-bud­get devices have 8–12 nm chipsets, and the most afford­able smart­phones have 18 nm or more.

There are now 7 main proces­sor man­u­fac­tur­ers on the mar­ket — Apple (A Bion­ic), Qual­comm (Snap­drag­on), Medi­aTek (the flag­ship Dimen­si­ty line and the sim­pler Helio), Huawei HiSil­i­con (Kirin), Sam­sung (Exynos), Google (Ten­sor) and Unisoc (Tiger, the cheap­est and least pow­er­ful of all list­ed above).

In the SoC per­for­mance rank­ing, Apple’s A15 Bion­ic ranks first. It is used in the iPhone 13 series and the iPhone SE (2022) smart­phone, is man­u­fac­tured using a 5nm process tech­nol­o­gy and is equipped with 6 cores (2 high-per­for­mance Avalanche at 3.223 GHz and 4 ener­gy-effi­cient Bliz­zard at 1.82 GHz).

In sec­ond place is the Medi­aTek Dimen­si­ty 9000 Plus, intro­duced in June 2022. It is man­u­fac­tured on a 4nm process and is equipped with 1 Cor­tex-X2 core at 3.2 GHz, 3 Cor­tex-A710 cores at 2.850 GHz, and 4 Cor­tex-A510 cores at 1.8 GHz. The first devices based on this SoC will be released only in the 3rd quar­ter of 2022, so it is too ear­ly to judge the actu­al pow­er.

Clos­es the top three Snap­drag­on 8 Plus Gen 1 from Qual­comm (4‑nm), pre­sent­ed in May this year. It received the same cores as the Dimen­si­ty 9000+, but a dif­fer­ent clock speed: 1 Cor­tex-X2 — 3.2 GHz (unchanged), 3 Cor­tex-A710 — 2.75 GHz and 4 Cor­tex-A510 — 2.0 GHz . It is based on the new line of Xiao­mi 12S, Asus ROG Phone 6 Pro, ZTE Nubia Red Mag­ic 7S and 7S Pro.

Sam­sung’s most pow­er­ful chipset, Exynos 2200, is in 8th place (4nm, 1 Cor­tex-X2 at 2.8GHz + 3 Cor­tex-A710 at 2.52GHz + 4 Cor­tex-A510 at 1.82GHz) — Sam­sung Series Galaxy S22.

Google Ten­sor (5nm, 11th place), installed in the Google Pix­el 6 line, received 2 Cor­tex-X1 cores at 2.8 GHz, 2 Cor­tex A76 cores at 2.25 GHz and 4 Cor­tex A55 cores at 1.8 GHz.

HiSil­i­con Kirin 9000 (12th place, 5nm) is the basis of Huawei Mate 40 Pro and Huawei Mate 40 Pro Plus. It has 1 Cor­tex-A77 core at 3.13GHz, 3 Cor­tex-A77 cores at 2.54GHz, and 4 Cor­tex-A55 cores at 2.05GHz.

The most pow­er­ful Unisoc chipset (Tiger T618) takes only 80th line (12nm, 2 Cor­tex-A75 at 2.0 GHz + 6 Cor­tex-A55 at 1.8 GHz). It is used in ZTE Blade V30 and ZTE Axon 20 4G.

Memory

Operational

In addi­tion to the proces­sor, the speed of the OS is affect­ed by the amount of RAM or RAM (“Ran­dom Access Mem­o­ry”).

Volume

RAM is need­ed to store infor­ma­tion that is used by the sys­tem at the cur­rent time. That is, when you start any appli­ca­tion, it is first loaded from the dri­ve into RAM, and then becomes avail­able to the user. The more appli­ca­tions run­ning in the back­ground, the more RAM is used. Accord­ing­ly, the larg­er the amount of RAM, the more appli­ca­tions you can run with­out brak­ing and freez­ing the OS (that is, the phone copes bet­ter with mul­ti­task­ing).

For exam­ple, the pop­u­lar game Gen­shin Impact requires 1.4 GB of RAM, while Minecraft and Asphalt 9 require 800 MB. This data is valid for the Android sys­tem. Thanks to iOS opti­miza­tion, even the top-end iPhone 13 Pro Max has 6 GB of RAM, which does not affect per­for­mance in any way.

For most Android smart­phone own­ers, 4 GB of RAM is enough. 6 GB is suit­able for gamers, 8 GB for users of the most demand­ing appli­ca­tions (and for the future). 10 GB or more is overkill, which con­sumes extra ener­gy and for which you pay more.

Speed

In addi­tion to the amount of RAM, it is impor­tant how fast it process­es infor­ma­tion.

Bud­get or old­er mod­els may use LPDDR1, LPDDR2, or LPDDR3 RAM. How­ev­er, these are out­dat­ed stan­dards with low per­for­mance and high pow­er con­sump­tion. Most devices now have LPDDR4 mem­o­ry up to 3200 Mbps or a mod­i­fied LPDDR4x vari­ant (up to 4266 Mbps). The lat­est gen­er­a­tion of LPDDR5 is installed in flag­ship smart­phones. It is 2 times faster than LPDDR4, 1.5 times faster than LPDDR4x and con­sumes less pow­er.

built-in

It is also called inter­nal / per­ma­nent mem­o­ry or stor­age. It is used to store data for a long time.

Per­ma­nent mem­o­ry is slow­er than RAM, but it has a larg­er capac­i­ty and costs less (which means it does not affect the final cost of a smart­phone so much). Now even the cheap­est smart­phones are equipped with at least 32 GB of inter­nal mem­o­ry. 128 GB is enough to store pho­tos, videos, music and games, but with­out head­room. 256 GB is enough for a cou­ple of years. A larg­er vol­ume (512 GB or 1 TB) may be need­ed by blog­gers.

Keep in mind that not the entire amount of inter­nal mem­o­ry indi­cat­ed in the spec­i­fi­ca­tions is avail­able to the user. Up to 20 GB can be occu­pied by the OS and sys­tem appli­ca­tions.

As with RAM, there are dif­fer­ent types of dri­ves that dif­fer in speed. How­ev­er, when choos­ing a device, you can not focus on this indi­ca­tor, because:

  • the type of built-in mem­o­ry is rarely indi­cat­ed in the spec­i­fi­ca­tions;
  • it depends on the cost of the smart­phone — bud­get devices have slow­er mem­o­ry, flag­ship mod­els have the max­i­mum;
  • in every­day use, you most like­ly won’t notice a dif­fer­ence.

Memory cards

The bud­get Sam­sung Galaxy A13 has ded­i­cat­ed space for a mem­o­ry card. Pho­to: www.gsmarena.com

Top smart­phones are increas­ing­ly miss­ing a mem­o­ry card tray. This is due to the fact that they have a suf­fi­cient amount of inter­nal mem­o­ry. Com­pared to stor­age, mem­o­ry cards are slow­er and less reli­able.

By default, microSD cards are designed to store pic­tures, videos and oth­er user infor­ma­tion, and the built-in mem­o­ry is used for installed appli­ca­tions. If nec­es­sary, you can trans­fer some pro­grams to microSD, but in this case, the per­for­mance of the smart­phone will notice­ably dete­ri­o­rate.

We rec­om­mend choos­ing smart­phones with a large stor­age capac­i­ty, and using a microSD card as a last resort (for exam­ple, when buy­ing a bud­get phone).

Camera

Mod­ern smart­phones have sev­er­al cam­eras with dif­fer­ent res­o­lu­tions and pur­pos­es. The pho­to shows Huawei P50 Pro with 4 image sen­sors on the back. Pho­to: www.gsmarena.com

Many users, when eval­u­at­ing a smart­phone cam­era, pay atten­tion only to res­o­lu­tion. But more megapix­els does not mean that the pho­to will be of bet­ter qual­i­ty. Qual­i­ty is also affect­ed by oth­er char­ac­ter­is­tics.

Permission

Cam­era res­o­lu­tion is mea­sured in megapix­els. This para­me­ter reflects how many mil­lions of tiny dots the final pho­to con­sists of. That is, a 12-megapix­el cam­era cap­tures images con­sist­ing of 12 mil­lion pix­els.

A pix­el is a pho­to­sen­si­tive ele­ment on the cam­era matrix, con­sist­ing of 4 sub-pix­els of dif­fer­ent col­ors. The most com­mon scheme is red, blue and 2 green. Some com­pa­nies use white or yel­low instead of the sec­ond green col­or (this allows you to get brighter pic­tures).

Many mod­ern smart­phones come with 64-megapix­el or even 108-megapix­el cam­eras. They use pix­el bin­ning tech­nol­o­gy or bin­ning (Sony Quad Bay­er, Sam­sung Tetra­cell, etc.). In this case, 4 or 9 neigh­bor­ing pix­els become one large one, con­sist­ing of 16 or 36 sub­pix­els, respec­tive­ly. This increas­es the light sen­si­tiv­i­ty and increas­es the dynam­ic range (that is, the dif­fer­ence between the light­est and dark­est part of the image). But the result­ing pho­to, due to pix­el bin­ning, has a res­o­lu­tion of 12 megapix­els.

Matrix and pixel size

The size of the matrix reflects the area on which the pix­els are locat­ed. The para­me­ter is indi­cat­ed in frac­tion­al parts of an inch (for exam­ple, 1/1.8″ or 1/2.3″, in the first case the sen­sor is larg­er). The larg­er it is, the larg­er the pix­els locat­ed on it can be and the bet­ter the light is cap­tured and the bet­ter the pic­ture. The pix­el size itself is expressed in microm­e­ters (µm).

For exam­ple, the new Xiao­mi 12S Ultra smart­phone has a 50-megapix­el main cam­era with a large 1‑inch sen­sor. After bin­ning, pho­tos are obtained with a res­o­lu­tion of 12.5 megapix­els and a pix­el size of 3.2 microns. Thanks to such a large pix­el, pho­tos have a min­i­mum of noise, a wide dynam­ic range and improved detail.

There­fore, a cam­era with a low­er res­o­lu­tion but larg­er pix­els can take bet­ter pho­tos than a cam­era with a high­er res­o­lu­tion and small­er pix­els.

Focal length and aperture

Focal length is expressed in mm. The high­er it is, the nar­row­er the view­ing angle. Con­verse­ly, lens­es with a low focal length shoot close, but with a wide angle of view.

Aper­ture or aper­ture is giv­en in f/number for­mat, such as f/1.9 or f/2.5. This para­me­ter reflects the amount of light that enters the cam­er­a’s sen­sor through the lens, and is the ratio of the focal length to the size of the lens entry hole. The small­er it is, the bet­ter.

The larg­er the aper­ture, the shal­low­er the depth of field. In oth­er words, only the sub­ject will be in focus, and the back­ground will be blurred. To increase the depth of field, it is nec­es­sary to reduce the size of the hole (how­ev­er, in this case, the bright­ness will dete­ri­o­rate). In mod­ern smart­phones, the depth of field is increased by soft­ware, or by installing sev­er­al cam­eras with dif­fer­ent focal lengths and aper­tures.

For exam­ple, Huawei P50 Pro has 4 cam­eras:

  • 50 MP, f/1.8 and 23mm;
  • 64 MP, f / 3.5 and 90 mm (tele­pho­to for tak­ing enlarged pho­tos);
  • 13 MP, f/2.2, 13mm (ultra wide for group shots);
  • 40 MP, f / 1.6 and 23 mm (mono­chrome for shoot­ing black and white images).

Stabilization and autofocus

The qual­i­ty of pho­tos is affect­ed by the pres­ence of sta­bi­liza­tion and aut­o­fo­cus. To com­pen­sate for trem­bling in the hands when shoot­ing in smart­phones, elec­tron­ic or opti­cal image sta­bi­liza­tion (EIS or OIS, respec­tive­ly) is used. The sec­ond option is more reli­able, but expen­sive. In the first option, the move­ment is com­pen­sat­ed by the soft­ware.

Now, many devices have advanced aut­o­fo­cus sys­tems installed. For exam­ple, PDAF responds quick­ly and main­tains focus bet­ter on mov­ing sub­jects.

In addi­tion to the above char­ac­ter­is­tics, the final qual­i­ty of pho­tographs depends on the cam­era soft­ware and the qual­i­ty of the lens­es installed in the lens. If you choose a phone for shoot­ing, it is bet­ter to read the reviews of experts. For exam­ple, in this arti­cle we have col­lect­ed 5 smart­phones cost­ing up to 35,000 rubles with a good cam­era.

Battery

Oppo Find X3 Pro sup­ports pro­pri­etary 65W Super­VOOC 2.0 fast charg­ing. It takes about 28 min­utes to ful­ly charge using the sup­plied adapter. Pho­to: www.gsmarena.com

Capacity

It is mea­sured in mil­liamp-hours (mAh). A bat­tery with a larg­er capac­i­ty does not guar­an­tee a longer oper­a­tion of the smart­phone with­out recharg­ing. After all, auton­o­my is also affect­ed by the pow­er con­sump­tion of the device, the diag­o­nal, the res­o­lu­tion and refresh rate of the dis­play, the proces­sor, the amount of mem­o­ry, etc.

Know­ing the bat­tery capac­i­ty, you can com­pare phones with approx­i­mate­ly the same char­ac­ter­is­tics. Oth­er­wise, it is bet­ter to focus on the esti­mat­ed bat­tery life on a sin­gle charge from the man­u­fac­tur­er (this infor­ma­tion is often indi­cat­ed in the spec­i­fi­ca­tions) or read the reviews of oth­er users.

For exam­ple, Poco F4 and Oppo Find X3 Pro are equipped with 4500 mAh bat­ter­ies. But the for­mer has bet­ter auton­o­my: 26:27 hours of voice calls / 14:52 hours of web surf­ing / 15:36 hours of watch­ing videos for the Poco F4 ver­sus 22:57 hours / 10:55 hours / 13:25 hours for the Oppo Find X3 Pro respec­tive­ly. The dif­fer­ence can be explained by a more resource-inten­sive screen (big­ger diag­o­nal, high­er res­o­lu­tion and pix­el den­si­ty, sup­port for 1 bil­lion col­ors) and a pow­er­ful proces­sor (Snap­drag­on 888 5G vs Snap­drag­on 870 5G).

Charging speed

Most mod­ern smart­phones sup­port fast charg­ing. For exam­ple, One­Plus Nord CE2 5G is 65W, while the bud­get Oppo A55 is only 18W.

To ensure the charg­ing speed declared by the man­u­fac­tur­er, a pow­er sup­ply of the appro­pri­ate capac­i­ty is required. Some man­u­fac­tur­ers (for exam­ple, Apple and Sam­sung) have removed the adapter from the pack­age. Accord­ing­ly, own­ers of the iPhone and Galaxy smart­phones will have to spend addi­tion­al funds to pur­chase them. For exam­ple, not the fastest pow­er adapter for Sam­sung (25 W) costs from 1,900 rubles.

We have reviewed the main char­ac­ter­is­tics of smart­phones. In addi­tion to them, there are many addi­tion­al ones (screen pro­tec­tor, 3.5 mm head­phone jack, NFC and oth­ers). But for many of them, only the pres­ence of a par­tic­u­lar func­tion is impor­tant.

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