AT&T vs T-mobile sim card in straight talk phone

difference between att and tmobile sim card in a straghttalk phone or service:

look at the SIM card numbers. If it starts with 890126 its T-mobile. 890141 for AT&T.
OR  check bottom of packaging of the phone. Look for the white label. Look on the right for an "A" or "T" (AT&T or T-mobile)

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