Apple iPhone users have been urged to restart their devices (and do so at least once a week) in the wake of a new virus scare affecting the devices. Two recently uncovered vulnerabilities in iPhones are being targeted by criminals - and despite the malware ...

If your iPhone isn't responding, and you're not able to power it off and then on again, you can force restart it to hopefully fix the issue.  Forcing a restart is different from a normal restart. Though that's the first thing you should try in this situation,