I am missing personal hotspot in my iphone4 after update ios 7.1

The following may have something that will help: http://support.apple.com/kb/TS2756

This worked for me!!! (saw this from a prior discussion)

al5555

TS2756 Re: Missing my personal hotspot

Mar 3, 2014 4:49 PM (in response to Hooishengjie)

I have finally found a solution that works for me.

To use my iphone (4s) as a hotspot and connect to my ipad (3) :

ipad settings: Cell Data OFF Wifi OFF Bluetooth ON.

iphone settings: Cell Data ON. Bluetooth ON. Personal hotspot ON. Wifi OFF (in that order)

I can connect the ipad to the iphone's hotspot using bluetooth and it works with no interruptions.

I am able to close down all apps on my iphone (including settings) and turn off the screen. The hotspot keeps broadcasting a signal.

A bit of a pain, but it works every time for me and has never disconnected.

Too bad Apple can't seem to come up with a fix!!