Who all are using ultrasn0w might’ve noticed that, you cant see Carrier Name, only you see signal bars. There was a bug in ultrasn0w which is fixed in this version.
Version 0.92 of ultrasn0w is in the main repo. Cydia will alert you of the upgrade, If you are using ultrasn0w. Also, devteam updated tweet saying that if anyone has issues with their 3G or EDGE connection they should clear and re-enter the APN settings.
MuscleNerd (one of the devteam’s member) confirmed that ultrsn0w has been tested in 25 countries without any issues and then only they took it live,