Hopefully this saves time for some people.
Issue: My brand new Skyrocket would not connect to AT&T data network from my home when it was sitting right next to my wife's Galaxy S2 that was connected to AT&T data network. NOTE: Minneapolis/St. Paul is non-LTE.
Troubleshooting:
1. Swapped sims -- Galaxy S2 still works; Skyrocket still doesn't work.
2. Factory reset Skyrocket (several times) -- Skyrocket still doesn't work.
3. Got online with AT&T support. Checked some settnigs. Factory reset. -- Skyrocket still doesn't work.
4. Per AT&T support, went back to AT&T store to exchange phone. At the store, AT&T person looked at my phone and turned off the WiFi that had automatically (and correctly) connected to their AT&T hotspot. Voila Skyrocket connected to 4G. Good news, but somewhat distrubing (I had done that many times myself). So, I decided to keep it and work with it some more.
5. Back at home, 4G still working....until I turned on WiFi (which automatically turns off AT&T data network). BAM!! AT&T data network would not come on again, when I turned off WiFi.
6. Next morning a Google search brought me to posts on XDA where others were having issues with the AT&T data network and MMS.
Root cause:
-APNs configured in my Galaxy S2 were **different** than the APN configured in my Skyrocket -- very much like the posts on XDA.
-"AT&T said the PTA network is brand new and they're still working out the kinks." from
APN Settings with working MMS (Skyrocket) - xda-developers
-Also pulled some data from here:
APN Settings? [Archive] - xda-developers
Solution:
Short version -- added 3 APNs and selected one of them.
Long version -- New APN Configuration that is working on my Skyrocket
==============
Galaxy S2 Skyrocket **modified configuration*** -- WORKING FOR ME!!!
**Not selected**
Name: ATT pta
APN: pta
MMSC:
http://mmsc.mobile.att.net
MMS Proxy: proxy.mobile.att.net
MMS Port: 80
MCC: 310
8MNC: 410
APN type: internet + mms + supl
**Selected**
Name: ATT Phone
APN: Phone
MCC: 310
MNC: 410
APN type: Inernet
Name: ATT WAP
APN: wap.cingular
Proxy: wireless.cingular.com
Port: 80
MMSC:
http://mmsc.cingular.com
MMS proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
APN type: mms
Name: ATT WAP2
APN: wap.cingular
Proxy: wireless.cingular.com
Port: 80
MMSC:
http://mmsc.cingular.com
MMS proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
APN type: supl
==============
Old Skyrocket configuration:
Skyrocket Out of the Box PTA -- not working for me
==============
**Selected**
Name: ATT pta
APN: pta
MMSC:
http://mmsc.mobile.att.net
MMS Proxy: proxy.mobile.att.net
MMS Port: 80
MCC: 310
MNC: 410
APN type: internet + mms + supl
==============
Galaxy S2 Out of the Box APNs -- working on Galaxy S2
=============
**Selected**
Name: ATT Phone
APN: Phone
MCC: 310
MNC: 410
APN type: Inernet
Name: ATT WAP
APN: wap.cingular
Proxy: wireless.cingular.com
Port: 80
MMSC:
http://mmsc.cingular.com
MMS proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
APN type: mms,supl
=============