Heating occurs when CPU is working continually in such a way that it is generating more heat than the cooling being provided by the cooling subsystem.


 

One cannot easily determine what might be issue in your case. If you are really bugged by the heating issue and believe that continue heating like this is going to damage your phone, you may perform following steps.

  • Hard reset your phone and set the phone network is 2G. Use only single sim and no memory cards. If you still face heating issue while calling, contact the customer support.
  • Enable 3G/4G on your device but not use the internet. Make sure you are getting all Bars or 80–100% signal. If you are not getting >75–80% network. Network might be the reason you are getting you phone heated up, as your processor is working extra to gather as much signal as possible.
  • Install your basic set of apps from play store, most of the time premium apps downloaded from free websites contain malware. These viruses work in background use your Processing, RAM and Network to collect data and send to it’s creaters.
  • Insert your memory card. A low speed High capacity memory card may be your problem as the android subsystem keeps scanning a defective card for indexing. Getting a class 10 or higher memory card will also boost up your power on timing.

There are many possibilities which promotes heating of cellphone. As i m unaware about your applications, storage, type of apps, charging methods, and handling ways. I m giving you ways which works best with Redmi Note 4:

  1. Redmi Note 4 comes with a hybrid slim slot. So, if you are using two sims and no sd card. Try to release your phone’s memory by reducing memory consumed by apps, data, photographs, etc
  2. If you are using a sim with sd card. Please make sure your data is being stored directly to sd card(including images, app data, cache data)
  3. Uninstall the apps which you dont need(depending upon your requirement, or if u rarely use one, or multiple app for same taste like delete one from facebook & facebook lite).
  4. Disable the apps which are played in background by force stopping/freezing it. It can be start/unfreezed again.
  5. Always charge your phone with the charger provided in the box by Xiomi.
  6. Avoid using your phone while charging.
  7. Put your phone away from sunlight, it may damages screen as well as increases heat.
  8. Try to turn off features like location, wifi, Mobile data when not in use.
  9. Remove all the background apps when not in use.
  • Note: Redmi Note 4 has a octa-core processor containing 8 cores, which means maximum 4–6 cores are used when we uses phone a lot and still 2 cores are idle.And hence phone doesn’t heats. And during extreme usage 8 cores are used rarely only in that case it can heat. So, it doesnt heat unless used while charging.

You can use battery optimizer apps.

Use GPS only when needed.

Do not use it while charging.

Heavy games can cause heating, so think of it.

otherwise if it doesn’t feels so hot, there is no problem in heating.

And if you are asking for a CPU cooler type work then till date it is not possible(only if you aren’t cooling it with your mouth).

Otherwise No problem, i also uses my device with a bit of heating issue.

Thank you 🙂