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 6 heating issues. Here at ifixit bd, we have dedicated and experienced technicians who specialize in repairing and resolving your iPhone 6 issues on your phone. ifixit bd is located in four different service points around Dhaka, Bangladesh.