My iPhone 12 heats up on charging.. Is it ok?
Yes, it is okay. Just keep in mind to not use it while charging, if you do so, the battery is going to heat up even more and you comprise your battery healt.
try not to charge to 100% as this causes stress to the battery, and generally never let it get dead flat and keep above 10% at all times
My 11 was heating up a little when I first got it. Now that it’s a year old it gets pretty hot . I swapped chargers and wires with my wife’s iPhone 8 the problem is still with my 11
I put in a warranty claim. If they cannot duplicate the problem it’s gonna cost me $650 for a new phone..