DevTeam updated ultrasn0w ^[1]. They removed the daemon and used ideas of GeoHot's purplesn0w ^[2], but implemented these ideas in a better safer way. New ultrasn0w 0.9 uses 152 bytes of baseband RAM, which is 6900 timesless than purplesn0w ^[2]. They also use mobile substrate to patch CommCenter, instead of patching the file itself.

Here is a list of features from DevTeam.

• Works on both 3G and 3GS.
• Works on hacktivated devices.
• Works regardless of how you jailbroke your device.
• Doesn’t patch any mach-o binary whatsoever.  (Doesn’t require a separate patch as each new firmware comes out).
• Doesn’t install any additional daemon
• Has no race conditions, no popups about “Missing SIM”, no network issues
• Is almost 7000 times smaller than its nearest competition
• Is available now via Cydia.  Source repo is http://repo666.ultrasn0w.com ^[3] (that last “0” in ultrasn0w is a zero!)

Anyway this new solution is a very good one. It uses good ideas in a good way. We recommend to use ultrasnow.