How to use personal hotspot in iPhone 5 and how to setup

Set up the feature with your cell carrier then activate it in settings.

Verify that your carrier supports Personal Hotspot for your device and that you have Personal Hotspot enabled on your cellular plan:

From Here > http://support.apple.com/kb/HT3574

Personal Hot spot

iOS System Requirements > http://support.apple.com/kb/HT3574

Understanding > http://support.apple.com/kb/HT4517

Trouble Shooting > http://support.apple.com/kb/TS2756