how to enable personal hotspot
Which device do you have and which plan are you on?
Device Software Version iOS 4 / iOS 5
Select General.
Select Network.
Select Set Up Personal Hotspot. If personal hotspot has been previously activated, skip to step 6.
The Personal Hotspot activation process may take 1-2 minutes.
Once the activation process is complete, select Personal Hotspot.
Verify Personal HotSpot is enabled. Drag the Personal HotSpot switch to ON to enable.
If prompted, select the appropriate setting.
The Personal HotSpot name will be displayed within quotes beneath the Personal HotSpot switch. e.g. Other users can look for your shared network using Wi-Fi and Bluetooth under the name displayed in quotes (e.g. 15-4-1391).
The Wi-Fi Password will be displayed in the Wi-Fi password field. To change the password, select the Wi-Fi Password field.
Enter/edit the Wi-Fi password then select Done. The Wi-Fi password must contain at least eight characters.
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Device Software Version iOS 6
Select Cellular.
If available, select Set Up Personal Hotspot. If personal hotspot has been previously activated, skip to step 6.
if your on the share everything hotspots included if your not then its 20-30 more a month