[AT&T Samsung Galaxy S II Skyrocket SGH-I727] saildiverdog:
Had to modify APN settings in Minneapolis/St. Paul

I'm a NOOB to Android, but not smartphones. I wanted to post this reply, because I found most of the information on XDA, but not all in one place. Hopefully this saves others much of the time that I've spent on it.

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. 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 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 http://xdaforums.com/showthread.php?t=1342159

-Also pulled some data from here: http://xdaforums.com/archive/index.php/t-1337171.html

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

MNC: 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

=============