Today DevTeam released an ultrasn0w update that fixes a bug for those who run it on firmware 3.1 and 3.1.2 with the 04.26 baseband. This bug was about a missing carrier name in the upper left-hand corner of your home screen. The update is avaliable in Cydia (repository http://repo666.ultrasn0w.com).
We remind you, that ultrasn0w 0.92 doesn't work with baseband 05.11.07!
[Update]: if your 3G or EDGE connection isn't working try manually clearing and re-entering your APN.
[Update 2]: Carrier logo fix confirmed (by order of tweet):
USA, Thailand, Austria, Trinidad, Germany, China, Kuwait, Serbia, Poland, France, Nigeria, Egypt, Pakistan, Ireland, UK, Turkey, Sweden, Switzerland, Malaysia, Hungary,The Netherlands, Bahamas, Jamaica, India,
Israel, Belgium, Canada, Portugal, Denmark, Costa Rica, Italy, Chile, Argentina, Brazil, Japan, Mexico, Venezuela, UAE.
Each European App Store is also carrying a fifth TomTom application offering a more narrowly localized version for the respective countries at a lower (~$30-40) price than the complete Western Europe version.
Benelux (iTunes link): offered in Belgium, Netherlands, Luxembourg and covers those three countries
D-A-CH (iTunes link): Germany, Austria and Switzerland
France (iTunes link): France and covers France, Monaco and Corsica
Iberia (iTunes link): Spain and Portugal and covers Spain, Portugal, Andorra, Gibraltar, the major islands of the Balearic and Canary Island groups.
Italy (iTunes link): Italy, San Marino and Vatican City
Nordic (iTunes link): Denmark, Finland, Norway, and Sweden and covers those four countries
U.K. & Ireland (iTunes link) - the U.K. and Ireland