The iPhone-dev Team’s popular software unlock, Ultrasn0w, was just updated to support iOS 4.3.1. This update fixes bugs, such as the signal bar issue. Please note that this update does not unlock any new basebands, but merely updates the existing unlock for use on 4.3.1. You can download Ultrasn0w version 1.2.1 via Cydia. The repo, if it isn’t already installed, is “repo666.ultrasn0w.com”. We will be releasing a guide on how to upgrade to 4.3.1 while preserving the baseband soon using Pwnagetool and Sn0wbreeze. Stay tuned!