New Phone Spec Sheet: What to Check First and What to Ignore

Launch posters shout numbers: more megapixels, more gigabytes, more watts. Only a few of them predict how the phone will feel a year from now.

This guide shows how to choose a smartphone by reading its spec sheet in order of importance. We won’t name a “best phone”, because that comes down to your budget and how you use a phone. Buying second-hand? Run our used-phone checks as well.

In this article7 topics

1. Before you compare: four answers about you
2. Deal-breakers: settle these four first
3. Everyday specs: what you’ll notice daily
4. Advertising numbers: tie-breakers at most
5. Run this list before you pay
6. Spec-sheet doubts, answered
7. Official sources used in this guide

Before you compare: four answers about you

Your habits trim a shortlist faster than any comparison site.

If this sounds like you	What it changes
Calls, WhatsApp and UPI are most of your day	You need much less processing power than gaming, editing videos or shooting at night demands
You keep each phone for four years or longer	Storage headroom, update years and battery care outrank the latest camera features
Your SIM is with a particular operator	That network decides which 5G bands the phone must handle
You know where you live and work	That decides how far you’ll travel for repairs

Deal-breakers: settle these four first

No setting or accessory fixes these after the sale, so use them to strike phones off your list.

1. Will 5G work on your SIM?

A 5G logo on the box doesn’t mean 5G on your connection. Every operator uses certain frequency bands for 5G, and your phone must handle the ones your operator has switched on where you live. Open the full specifications and find the list of 5G NR bands (usually under Network or Connectivity), then check it against your operator’s. Our guide to getting 5G working on Jio, Airtel or Vi covers bands and settings.

2. How many years of updates remain?

Most big brands publish an update period for each model, and it runs from launch day, not from the day you pay. A phone that has been in shops for a year or two has already spent part of it.

Google is a handy example. Its Pixel update policy gives the Pixel 8 and every later model seven years of both OS upgrades and security patches, and the Pixel 6 and Pixel 7 series five years, counted from the date each model was first sold through the US Google Store. For any other brand, look up that exact model’s policy and subtract the time since launch.

3. Does the SIM layout suit your numbers?

Keep a work number and a personal one? Android phones handle two lines in a few ways: two nano-SIM slots, one nano-SIM slot plus an eSIM, or a hybrid tray that can cost you the memory card (see the storage section).

On iPhone, Apple’s Dual SIM help page says models from the iPhone XS, XS Max and XR onwards can combine a physical SIM and an eSIM, and from the iPhone 13 onwards two eSIMs work as well. Both numbers can make and take calls; mobile data, though, uses just one line at a time, and using two different operators requires an unlocked iPhone.

If you plan to use an eSIM, check with your operator how it hands one out and how you’d shift it to a future phone. For weak signal indoors, our Wi-Fi calling guide shows how to find out whether your network supports it.

4. Can you get it serviced near home?

• Buy from an authorised source: the brand’s store, an authorised dealer or its official shop on a marketplace. Get a GST invoice that names the model and lists the IMEI.
• Go through the warranty card for how long cover lasts, what isn’t covered (liquid and physical damage being the big worries) and whether the battery and accessories have their own terms.
• Before buying, put your PIN code into the brand’s service-centre search. If your district has no centre, expect to courier the phone and wait a long time for it.
• Ask about any “international version”: will the brand’s service centres in India honour its warranty?
• Verify the BIS mark. If you see a BIS Registration Mark on the box or label, enter its eight-digit R-number in the BIS CARE app. The app confirms it under BIS’s Compulsory Registration Scheme and tells you who the registered manufacturer is.
• Store the bill and the box somewhere safe. You’ll need them if the phone is ever lost; our guide explains how to block it on CEIR.

Everyday specs: what you’ll notice daily

The chip: decode the name, skip the leaderboard

The chipset (processor, or SoC) governs speed, battery efficiency and photo processing, and often houses the modem too. Rather than trusting someone’s ranking, learn to read the name.

Take Qualcomm’s Snapdragon line-up. Flagship phones get the 8 Series. The 7 Series sits in what Qualcomm calls the high tier, with premium AI and camera features. The 6 Series is pitched on efficiency and performance, the 4 Series covers the everyday features most people want, and the 2 Series aims to bring mainstream mobile technology to buyers who might otherwise go without it. Many newer chips are named on a “Snapdragon [series] Gen [number]” pattern. Read the first number as the tier; the Gen number gives the generation inside that tier, and a higher one means a newer chip.

When you’re comparing	What usually holds
One series, two generations	Choose the newer generation in most cases; later ones tend to be more efficient and better at handling images
Different series	Moving up a tier usually brings a stronger GPU, better photo processing and a stronger modem, on top of speed
An older flagship vs a newer mid-range chip	The old top-tier chip may still be faster, but it can run hotter and may have less update time remaining
MediaTek, Samsung, Google or Apple chips	Each brands its chips differently, so check the chip maker’s own site rather than reading meaning into the digits

RAM: only the physical number counts

RAM is where open apps wait for you. With enough of it, WhatsApp, the camera and your UPI app stay open in the background instead of reloading each time you switch. Once your regular apps fit, more adds very little.

Ignore “extended” or “virtual RAM” figures: that is storage borrowed as overflow, far slower than true RAM. Judge phones on physical RAM alone.

Storage: UFS or eMMC, and the space you really get

Listings often bury the storage type, but it’s worth finding. A 2013 comparison from Toshiba’s memory business sets out the difference. eMMC is half-duplex, so at a given instant it can read or write but not both. UFS is full-duplex, so it reads and writes simultaneously, and its interface is faster. Toshiba positioned eMMC for designs where keeping cost as low as possible comes first. The difference shows up when apps install, burst shots save and system updates run.

When the brand’s spec page lists the storage type, pick UFS; among UFS versions, a higher number is a newer, faster generation. If the page gives capacity alone, ask the seller instead of guessing.

• You get less free space than advertised. The operating system and preinstalled apps already occupy part of the capacity printed on the box.
• Check the card slot. A microSD card suits music, photos and videos, but apps work best when installed on internal storage. A hybrid tray has a second slot that holds either a microSD card or a nano-SIM, not both, so if you use two SIMs you get no expansion.

The screen: panel, smoothness and sunlight

Compare	OLED / AMOLED	LCD (usually IPS)
Light	Each pixel lights itself	A backlight sits behind the panel
Blacks	Pixels switch fully off, giving deep blacks and strong contrast	Dark scenes may look a little grey
Always-on display	Common, because unlit pixels use no power	Rare
Downsides to watch	Faint marks from static icons shown for years; some eyes are bothered by dimming flicker	Colours can look duller

Refresh rate counts how many times a second the picture is redrawn. At 90Hz or 120Hz, scrolling is smoother than at 60Hz, at the cost of extra battery drain, unless the phone slows the rate whenever the image is static (often marketed as adaptive refresh). The touch sampling rate is a separate number that matters mostly to competitive gamers.

Treat brightness claims carefully. The “peak” nits figure is often reached only for a moment, on a small patch of the display, during HDR video. For a map at midday, what you need is the brightness of the full screen outdoors with auto-brightness on, a figure many brands never publish.

Battery life and the charger question

The mAh figure is the size of the tank, not the distance it covers. Battery life also hinges on how efficient the chip is, the display, how the software handles background activity and your signal, because a phone searching for network in basements and on trains drains quicker. Independent reviews that run the same test on every phone are a better guide than the capacity number.

• The wattage is a best case. A phone hits its advertised speed for only part of a charge, typically with the charger and cable from the same brand, and it slows down as the battery level climbs or the phone warms up.
• Check the box contents. Some phones include just a cable, and some bundled adapters can’t match the phone’s maximum speed.
• Know the charging standard. Some phones fast-charge using USB Power Delivery; others use a system specific to the brand. Learn which one yours uses before buying a charger, because the wrong adapter means slower charging.

Build and water resistance

An IP rating has two digits. According to the IEC’s explainer on IP codes, the first, from 0 to 6, covers protection against solid objects (a 6 means fully sealed against dust), and the second, from 0 to 9, covers liquids. It adds that a rating reflects the test, not where you can safely take the device.

Samsung’s India support page on Galaxy water resistance shows how narrow the test is. Samsung tested its IPx8 phones by keeping them motionless in fresh water 1.5 metres deep for 30 minutes, a test it says meets IEC 60529. It warns against going deeper or exposing the phone to high water pressure, tells owners to keep phones out of pool water and salt water, and notes that the protection doesn’t last forever and can wear down with use. If the phone gets wet, dry it with a cloth before charging.

Judge the rest of the build in your hand if you can. Plastic backs weigh less and are less prone to shattering; glass backs can crack in a fall, so set aside money for a case.

Advertising numbers: tie-breakers at most

• “Virtual” or “extended” RAM: storage on loan, not memory.
• Megapixels on their own: processing, lens quality and sensor size count for far more, and “macro” or “depth” cameras with low resolution rarely improve anything.
• Peak nits: a best-case figure from a small area of the screen.
• Benchmark posters: numbers the brand produced itself. How hot the phone gets and whether it stays fast through a long game tell you more.
• Vague “AI” badges: ask what the feature does in practice and whether it depends on a connection, a sign-in or a subscription down the line.

Run this list before you pay

1. Decide your spending limit and the three things the phone must do well.
2. Match the 5G NR bands against your operator’s list.
3. Work out the update years left from today for that model.
4. Make sure the SIM, eSIM or hybrid-tray layout fits the numbers you carry.
5. Locate an authorised service centre near you using your PIN code, and buy only from an authorised source with an invoice that lists the IMEI.
6. Note who makes the chip, plus its series and generation.
7. Count real RAM, not virtual, and find out whether storage is UFS or eMMC.
8. Check the screen by a window instead of trusting peak brightness.
9. Look for independent battery reviews, and confirm which charging standard the phone uses and what the box includes.
10. Check the warranty’s liquid-damage terms alongside the IP rating.

Spec-sheet doubts, answered

How much RAM is enough for me?

Enough for your daily apps to stay open while you switch between them. Beyond that point, a quicker chip, UFS storage and a longer update promise are better uses of your money.

Where do I find out if the storage is UFS or eMMC?

On the brand’s own website, open the full specifications and look in the Memory or Storage section; the type and version sometimes appear there. If you see capacity alone, put the question to the seller and keep the answer in writing.

Is an IP68 phone safe in a swimming pool or the sea?

Don’t count on it. The IEC says a rating tells you about the test, not about everyday use, and Samsung’s guidance for Galaxy phones is to keep them away from pool water and salt water. Samsung also says water resistance fades over time.

There’s no charger in the box. Should that rule the phone out?

No. Budget for an adapter instead. Check the phone’s fast-charging standard first, then choose the brand’s own charger or one from a trusted maker that supports the same standard.

Can one iPhone hold numbers from two different operators?

Yes, as long as it’s unlocked. From the iPhone XS, XS Max and XR onwards, an iPhone can combine a physical SIM and an eSIM, and models from the iPhone 13 can also run two eSIMs. Both lines handle calls, while mobile data comes from only one of them at any moment.

Official sources used in this guide

• Qualcomm: Snapdragon mobile processors, grouped by tier
• Toshiba America Electronic Components on UFS versus e-MMC (November 2013)
• IEC: what Ingress Protection (IP) codes mean
• Samsung India support: water resistance on Galaxy phones
• Google Pixel Help: the Pixel software update schedule
• Apple Support India: Dual SIM on iPhone, including eSIM
• Bureau of Indian Standards: checking R-numbers with the BIS CARE app
• Department of Consumer Affairs: National Consumer Helpline