iOS updates and make sure you are using the latest iOS. Make sure
your iPhone is up to date with the latest software. Issues with
calls can be with simply not updating your device. Those updates are
made to fix glitches that occur. (Settings>General>Software
extreme temperatures. Temperatures higher than 95 degrees F can
irreversibly permanently damage battery capacity. In colder
environments , battery life will decrease however once the device
performs to its optimum temperature range 62 F-72 F, its performance
will return back to normal.
cases when charging to avoid access heat.
display or turn Auto-Brightness to extend battery life (settings>
display & brightness
use your device to access data, wifi consumes less power so keep
your wifi on at all times. (Settings> Wifi to access a wifi
App Background Refresh for applications that are not needed to
refresh as often. (settings> general> background app refresh
and switch to off)
and Background Location you can optimize battery by turning some
apps off (settings> privacy> location services)
coverage and low signal. You can optimize your battery life by
turning phone on Airplane Mode. You cannot make or receive calls
while in Airplane mode
persists, take your device to an Apple Retail Store
draining up your battery (tap Battery> see apps and services
using the most battery and get details and change options that can
troublesome apps to stop
Apps> select application> Force Stop> Ok
persists, contact authorized service provider.
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