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I don't know if I have an "ultimate" ipcc, but I have everything working on my 3GS running 3.1.

If you are on a non-iPhone messaging plan, and AT&T has provisioned you for MMS but it still isn't working, go to Settings>Network>Cellular and make sure the fields are as follows:

APN: wap.cingular
Username: wap@cingulargprs.com
Password which is case sensitive: CINGULAR1
MMSC: mmsc.cingular.com
MMS Proxy: 66.209.11.32

I've found as I updated to different 3.0 betas and 3.1, that often the username and password would disappear despite loading the same ipcc. Though, on the flip, MMS has sometimes worked when they were blank. But, if you fill them out all should be right with the MMS world.
 
I don't know if I have an "ultimate" ipcc, but I have everything working on my 3GS running 3.1.

If you are on a non-iPhone messaging plan, and AT&T has provisioned you for MMS but it still isn't working, go to Settings>Network>Cellular and make sure the fields are as follows:

APN: wap.cingular
Username: wap@cingulargprs.com
Password which is case sensitive: CINGULAR1
MMSC: mmsc.cingular.com
MMS Proxy: 66.209.11.32

I've found as I updated to different 3.0 betas and 3.1, that often the username and password would disappear despite loading the same ipcc. Though, on the flip, MMS has sometimes worked when they were blank. But, if you fill them out all should be right with the MMS world.

Did you find in the 3.1 beta that the Voice mail APN is gone also. Mine is. I just have cellular data and MMS under cellular data.
 
The Ultimate ipcc

Here you go guys! Modified from the newest 4.2 file found in the 3.1 Beta. Every single thing work perfectly together: Data, MMS, Voicemail, Tethering etc.

You don't have to go in to the networking settings to change or configure anything. It works perfectly right out of the box when you use this .ipcc.

I even changed the domain entries in the MMS settings to the ip addresses that they resolve to so sending MMS messages are a bit faster!

Enjoy!:
http://rapidshare.com/files/255676733/ATT_US.ipcc.html
 
Here you go guys! Modified from the newest 4.2 file found in the 3.1 Beta. Every single thing work perfectly together: Data, MMS, Voicemail, Tethering etc.

You don't have to go in to the networking settings to change or configure anything. It works perfectly right out of the box when you use this .ipcc.

I even changed the domain entries in the MMS settings to the ip addresses that they resolve to so sending MMS messages are a bit faster!

Enjoy!:
http://rapidshare.com/files/255676733/ATT_US.ipcc.html

anyone else on 3.1 tested this yet?
 
I installed the carrier file on my phone and it enabled MMS, but when I try to send anything I'm getting a "message was not sent" error.

Anyone know how to get around that?
 
I installed the carrier file on my phone and it enabled MMS, but when I try to send anything I'm getting a "message was not sent" error.

Anyone know how to get around that?
Did you install your sim in a MMS enabled phone? Do that and it should work after you sent an mms from the capable phone.
 
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