Problem solvinng when error occur in iphone

The most common problem on apple device is-
-update the ios to improve the wi-fi connectivity.
-reset network setting
-disables the Bluetooth when not in use.
when you siding a problem with apple product you may avenue the apple tech support through their website or can call or mail.

? What is the most common problem on an iPhone?

The battery is worse than a Nokia phone that’s on fire and dipped in acid

There is abattery staving mode. And Perhaps people should close apps when Not using them.

Weird, my battery lasts quite long, and i have an 5s