your calls and txts are not carried over VZW's data network...thats why they work...my guess is you're not going to get data (or at least 4G data) with that SIM card...
Verizons gs3 uses LTE and evdo, basically CDMA for data, T-Mobile uses hspa+ for data so unless you are in an area that T-Mobile had LTE in than,( thats if they use same lte channel) you won't get high speed data, you might get edge.
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