I have a Nexus 1 PB99110 AT&T version phone, V2.3.4, using it since December. Recently, I started having lots of trouble with no signal or data connectivity. The Cellular Signal and 2G/3G data icons will constantly change from green to white to gone to no service to emergency calls only, back to all green, etc. this has started happening over this weekend and I didn’t make any known changes to the phone. I have uninstalled the last few apps I installed from the Android Market. I am really confused any help of yours will be dearly appreciated.