Use an AT&T 3G SIM in a 4G LTE phone

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rani9990

Senior Member
Apr 21, 2012
1,522
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Fremont
Hopefully no one has posted this before me.
Many of you must have, at one point tried to put an AT&T 3 G SIM into a 4G LTE phone. Of course, you would then see that calling and texting worked, but no data!
Well, here is a simple method to enable data. Go to your APN settings and add wap.cingular for the APN. Cyanogenmod will already have that APN in there under the name ATT, but most stock ROMs don't. The name can be whatever you like.

Sent from my SGH-I897 using XDA