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Old June 18th, 2013, 10:28 AM   #4 (permalink)
Atma
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Join Date: Dec 2011
Location: North Carolina
Gender: Male
Posts: 6,070
 
Device(s): Samsung Galaxy S4, Samsung Galaxy S2; Nexus 10
Carrier: T-Mobile

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The apn is what you need for data to work.

Go to settings > connections > more networks > mobile networks > access point names. You should see an apn for AT&T. If you don't you will need to add it. I have the T-Mobile S4 so I'm not sure what the settings would be for AT&T.

I found these for the AT&T S4. You can see if they work if you don't have it. Press your menu button and select New APN.

Name: ATT Phone
APN: phone
Proxy: Not set
Port : Not set
User name: Not set
Password: Not set
Server: Not set
MMSC: http://mmsc.mobile.att.net
MMS proxy: proxy.mobile.att.net
MMS port: 80
MCC: 300
MNC: 410
Authentication type: None
APN type: default,mms,supl,hipri
APN protocol: IPv4
APN roaming protocol: IPv4
Enable/disable APN: APN enabled
Bearer: Unspecified
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