I tried the "backdoor dialing" program from Gizmo5 which makes it possible to call my Tmobile number for free calls from any computer running Gizmo software. It surprisingly worked for a US call and a call from Brazil, both with decent quality. But I get an announcement after 30 minutes saying the call will be terminated.

Anyone know how to get a longer call than 30 minutes? Maybe if I buy some minutes on the PC it will allow that?

See More: Free Calls From PCs to Tmobile Using Backdoor Dialing Limited to 30 mins?