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    galaxy s4 att unlocked phone not allowed mm#6

    So I have this galaxy s4 att using with tmobile network, it worked flawless, then suddendly phone not allowed mm#6 message appeared and I dont get no signal, called att and they said imei is clean , anybody have an idea how I can fix this , att even gave me the unlock code for the sim card
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    att s4 on tmobile network, internet is real slow

    I have a att s4 that im using with a tmobile sim card everything works good except for the internet that it constantly gets real slow and sometimes wont connect at all,someone knows if theres a fix for this and how to do it