Nokia Lumia 900 was released a couple of days ago and is selling like a hot cake, but some owners are experiencing issues with data connectivity on the phone. It seems that guys at winsource.com found a way to temporarily fix the problem.
Some phones are shipped without correct APN info, so you have to add your own. The correct info to enter is:
APN = wap.cingular
USER = wap@cingulargprs.com
PASS = cingular1
Check the video: