We've figured out what was causing this issue and now have a fix available for the SMS and MMS issue for iOS 5.1.1 on the GSM iPhone 4S.

GEVEY™ has recently reported that users who have upgraded their iPhone 4S to iOS 5.1.1 and use the GEVEY™ Ultra S to unlock their phone may have problems with their custom SMS and MMS settings.

The recent actions taken by Apple to block a server activation exploit has rendered the GEVEY™ Ultra 5.1 for GSM iPhone 4 inactive. Apple N Berry is recalling all GEVEY™ Ultra 5.1 for GSM iPhone 4 purchased from Apple N Berry, LLC. If you purchased this GEVEY version from another vendor, please contact that vendor for more information.