For that reason we recommend backing up to your computer as well as i Cloud.
Apple's newest version of the i Phone and i Pad software - i OS 11 - arrived on 19 September 2017.
Updating some i OS devices (i Phone 5s and earlier and i Pad Air and earlier) to i OS 9.3 can require entering the Apple ID and password used to set up the device in order to complete the software update.
In some cases, if customers do not recall their password, their device will remain in an inactivated state until they can recover or reset their password.
If you encounter any problems following the update to i OS 11 let us know in the comments, you can also check whether we have covered the fix here: What to do if you can't update your i Phone to i OS 11.
Installing i OS 11 is a simple process but there are a few things you should do first outlined below - and we recommend that you do if you want to minimise the chance that you might lose data or have problems with your i Phone following the update.