Spec-sheet red flags: marketing claims to read twice
A phone’s marketing page and its spec sheet are written to sell. Most of what they say is accurate, but some numbers are true only under special conditions. Here are the ones worth a second look. For the basics, see how to read a phone spec sheet.
“Up to” figures
“Up to 2.5 GHz” or “up to 90 W” describes a maximum, not what you get all the time. Chips slow down when they get hot, and a charger’s top speed usually applies only for part of the charge. Our charging time calculator uses assumptions you can change.
Peak brightness
A very high number, such as thousands of nits, is usually a peak value for a small part of the screen under special conditions, not what the whole screen shows all day. Compare the typical brightness if the maker lists it, and look at the screen outdoors if you can.
Megapixels
More megapixels does not mean a better photo. Sensor size, lens quality and image processing matter as much. A secondary camera listed at 2 MP adds little. Compare sample photos from the same model.
Virtual or extended RAM
Some phones borrow part of the storage to act as extra RAM. This is not the same as real RAM, and it is slower. Compare the physical RAM only. See how much RAM and storage you need.
Battery size and battery life
A bigger mAh number helps, but life also depends on the screen, the chip and the software. Compare phones using the same measure. See what a 6,000 mAh battery means.
Refresh rate
A 120 Hz or 144 Hz screen is smoother when scrolling and for apps that support it. Many apps and games run at lower rates, and a higher rate can use more battery.
Missing information
If a listing leaves out the chipset, the battery size or the charging speed, ask. A seller who does not know the answer is a warning sign.
A quick checklist
- Is each number a peak or a typical value?
- Is the RAM physical?
- Is the chipset named exactly?
- Is the charger included at the rated power?
- Can you find an independent review of the same model?
Use the compare tool to put two models side by side, and decide on the numbers that matter for how you use your phone.
