Try a restart and/or forced restart:
Restart your iPhone, iPad, or iPod touch - Apple Support
If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
Try a restart and/or forced restart:
Restart your iPhone, iPad, or iPod touch - Apple Support
If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
update to iOS 11.1.1 if you have not done so already.
Just updated still no fix
Still nothing
When I receive a message that has “I” in it, it is replaced with an “A” followed by a question mark inside a box