Step by step this is what i did:
1. Install freetether & mobile hot spot
2. Connect your PC/Mac to mobile hot spot
3. Go to you PC/Mac's network settings & write down: Subnet Mask, Router/Gateway & DNS
4. On Xbox, PS3, etc go to network settings & "MANUALLY" set up your wifi connection.
A. In IP Address put exactly what your PC/Mac's wifi is using except add 1 to the last digit, so if its a .1 make it .2 on your PS3, Xbox, etc.
B. Then input DNS, Gateway/Router & Subnet Mask EXACTLY how you wrote it down.