great cydia tweak

MyWi 4.0

Price: $19:99

Developer: Intelliborn

Yep it does have a high price tag, but if you in need of a WiFi hotspot wherever you are then this is the App for you.
MyWi 4.0 basically turns your iPhone into a portable hotspot, allowing you to connect your iPad or laptop to the internet at any time. The App uses your data so make sure you have a decent or unlimited data package before you start running it.