Exchange 2010 - iPhone will work in Wifi but not ATT 3g

Hello Everyone,
This is my first time posting, but I'm desparate!
I have an Exchange 2010 environment at our CoLo (not on site). I can connect to it on my iPhone 4 on ANY wifi network (home, work, etc), but if I connect to it via ATT 3g - no dice. I'm pretty sure it's a DNS issue, but there's no way for me to see what ATT DNS servers are returning. Anyone else have this problem? Does anyone know how long ATT caches DNS queries? Thanks in advance!
EDIT: It's totally DNS. I cannot hit OWA in safari either while on ATT, but again it works on WIFI everywhere. I setup DNS a little less than 24 hours ago, so I'm surprised that ATT is still having issues with it... Now I wonder if I can call ATT and see if they can flush the cached queries >.<

EDIT 2: Of course ATT was useless. Tried to transfer me away from them (to Apple and even Microsoft lol). I guess it's just a waiting game to see if their DNS servers get with the program...

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