Sometimes the iPhone 6s is so warm that the users find it difficult to hold it down with their hands. This is a clear indication of overheating in the iPhone 6s. Some similar cases of overheating include:

• Phone gets way too hot while charging.
• Phone gets hot and the battery drains drastically.
• The iPhone can perform simple tasks e.g., Making a phone call, watching a YouTube video, taking a photo without getting hot.
• The iPhone gets warm on standby mode for no apparent reasons whatsoever.

(Note: if your phone gets too hot while transferring data for the first time from a previous iPhone, chances are it is a one-time issue and will not happen again.)

These are some of the most discussed problems in Apple’s user threads and community. However, there are some DIY (Do it Yourself) fixes that you may try which may help you to resolve your overheating issues

• Disable background app refresh.
• Disable background app refresh from here: Settings > General > Background App Refresh
• Turn off Bluetooth / Location services to reduce processes running in the background
• Most of the users have reported they only get heating in older iOS, try updating your iOS to later versions to check if it works for your phone.

If none of the fixes above work for you, you might need to get it looked at by professional technicians who specialize in resolving iPhone 6s heating issues. Here at ifixit bd, we have dedicated and experienced technicians who specialize in repairing and resolving your iPhone 6s issues on your phone.