Why does my iPhone keep asking for my iCloud login?

This is an old bug, but one that we keep seeing. Sometimes an iPhone gets into a loop of continuously asking for your iCloud login details and password. Even when you enter your Apple ID, and password, it quickly asks for it again (and again, and again). Having an iPhone that is stuck in the iCloud login loop can be extremely frustrating. Fortunately, help is at hand. In this feature we have five different fixes for the iCloud login loop.

The iCloud login loop bug can be caused by a faulty Wi-Fi connection, and the easiest way to fix it is to power down the iPhone and power it back up again. This only takes a few minutes, and if it fixes the problem, it'll save you a lot of other troubleshooting. Follow these steps to switch your iPhone off and on again:

* Hold down the Sleep/Wake button (on the top of the iPhone, or on the righthand side if it's a 'Plus' model) for around five seconds until Slide To Power Off appears.

*Slide the power icon to the right.

* Wait around 30 seconds for the screen to go completely black.

* Press the Sleep/Wake button to switch the phone back on.

When it wakes up, it'll take a while before starting up iCloud. You may be asked for your iCloud password, but once it's entered one more time you should be fine.

Source: Macword