Re: [Q] Group SMS App without having contacts stolen
OP is referring to a (potential) security breach when using a secondary sms service like whatsapp. Gosms and Handcent are just third-party sms software.
As per your answer, the later mentioned apps should have group mms. And I can confirm 4.2 AOSP mms has working group mms, but requires more work to get it running.
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