Cancel Your T-Mobile Contract With No Fee!
Cancel Your T-Mobile Contract without an Early Termination Fee
If you act soon you should be able to cancel your T-Mobile contract with no early termination fee (ETF).
As it turns out, T-Mobile recently introduced a limit on the amount of domestic off-network data (roaming data) whereas previously there was no limit.
What this means is that if you call into T-Mobile and cancel your service you should be able to actually cancel your service without paying an early termination fee. Make sure you act fast however, as the service change happened at the end of February and there is only a limited time to call and cancel regarding the change in data plans.
Hope this helps out
Here is a link to a more in depth post on a forum