Today I jail-broke my 4S..all was well until I installed SBSettings and turned off the 3G. When doing this is it breaks the connection with Sprint causing No Service until it is fully restored. I just got confirmation by the Devs in the IRC chat room. Just wanted to put that out there to people.

*DO NOT INSTALL SBSETTINGS AND TURN OF THE 3G* This applies to Sprint im not sure about Verizon users.