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[Q] Simultaneous Voice and Data GS3 T-Mobile

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http://forum.xda-developers.com – I have a GS3 with T-Mobile prepaid (60 a month) my Simultaneous Voice and Data is not working? is this a problem with the prepaid service? the Simultaneous Voice and Data will work for a few min's then cut off and i cant get data back until i end the call im on. I'm running Cm10 Nightlights I was on Simple mobile and had the same problem. is this a phone problem, service problem, ROM problem? i thought T-Mobile supported Simultaneous Voice and Data? (HowTos)