Make sure you have the proper APN settings under menu / settings / wireless and networks / mobile networks / access point names. Those must be configured for proper data access.
Google: 'your carrier + apn android' and you'll find the appropriate settings.
i had just got my dz in today and i was having the same datA problems thank you so much i feel so DUMB that i didnt kno this and now my data works GREAT ur help was very much aprreciative and rewarding
Samsung Galaxy SII Skyrocket, iPhone 4, Bold 9900, Sony Ericsson Xperia Arc S
I went ahead and ordered a DZ A7275 from GSM Nation on Amazon for $540. Good price, and I'm excited to get in the next couple days. I'll be selling the iPhone 4, and lowering my data plan. Back to $10 data!