Allright so far I have tethering working and MMS does show up in messages but does not work also my Visual Voicemail is working, I'm running 3.0(7a341) leaked on torrents a couple days ago.
this is what i did,
1) Downloaded the "mobilecongfig" from
http://www.benm.at/help/ yesterday, but i managed to upload it here. (DO NOT DOWNLOAD FROM THE benm.at SITE CAUSE SOMEONE MESSED IT UP OVER THERE)*
*download and unzip. then e-mail to self, open on Mail on iPhone, Install.
2) Did this according to Instructions (I believe it's mac only)
http://9to5mac.com/iPhone-3G-tethering
3) "Cellular Data Network" menu appeared under "settings" > "general" > "network"
4) put in the info supplied for MMS on
http://www.benm.at/help/
U.S.A
AT&T
APN: wap.cingular
User:
wap@cingulargprs.com
Pw: CINGULAR1
MMSC: mmsc.cingular.com
Proxy: 66.209.11.32
5) At this point my VV wasn't working so tried the advice from a comment,
"EASY VOICEMAIL FIX! (restores original carrier settings)
Wed, 06/17/2009 - 11:29 ben (not verified) 0 points
Ok heres how you fix your voice mail-
1. Connect the phone to itunes and option click restore
2. Navigate to your user name->Library->iTunes->iPhone Carrier Support
3. Select the file contained within "iPhone Carrier Support" and proceed
You now have your voicemail working again"
6) took out sim and put it back in while restarting the phone.
Theese Instructions are AT&T only! and is what worked for me, MMS still doesn't work but at last I see the camera icon! lol!