Static IP?

[Advisor]

I'm having some IP issues while connecting using WiFi tether for rooted users on an Android Device (Metro PCS)

Every time I make a new connection it changes my IP slightly. This causes me to get booted back to log in screen and no connection to be made to P99.

Anyone have any suggestions on how to keep my IP constant?

I've tried Easy tether pro, and PDAnet. Same problem. I think the switch is coming from my ISP (Metro PCS)

Any help would be much appreciated