Nokia has already released a software patch for the AT&T edition of Nokia Lumia 900 model.
This patch should fix the networking related issues faced by some users on their units.
The company said in a statement:
A little while after the Lumia 900 went on sale, we discovered a software issue that can sometimes lead to lost data connectivity. This issue is purely in the phone’s software, and isn’t related to the phone hardware or the network itself. We apologize for any inconvenience this may have caused, and as a gesture of goodwill, we are offering a $100 AT&T bill credit to everyone who has already purchased a Nokia Lumia 900 or who will purchase one before April 21st.