Mine is att brand unlocked, and now with airvoice provider. I have seen on internet several have the same "problem". If land lines call me, they have to wait for the 3rd ring to make my 1st ring on my phone. One says, I have to change all the ringtone format to something mav/mva things. Some suggest to get the "disabling increasing tone" app;but mine doesn't increase. In fact, when somebody calls me from the same provicer (airvoice), it is ring right away. Any help please?