Once that telltale red dot shows up on your device's Settings app, you're ready for i OS 10.
Apple rolls out the update gradually beginning on the morning of Tuesday, September 13.
Go to Settings | Reset | Reset Network Settings and then tap Reset in the dialog box.
When your device has completed the reset, rejoin your Wi-Fi network and try the update again.4.
Be warned, doing this will require you to enter all of your Wi-Fi passwords again.There are reports of this update causing problems, but Apple's fixed the bug, it says.Still, it's important to back up everything just before you make any big changes.An i OS update could require between 1GB and 2GB of free space on your phone.To be on the safe side, make sure there's at least 2GB of space freed up before you update.