I messed around with this all day on my 8Gb 3G (on Softbank if that makes a difference). Following the steps here: http://www.iclarified.com/entry/index.php?enid=10188 I tried numerous things: 1. iOS 4.0 install + redsn0w 0.9.5b5-4 then backup of data = no mms/3g No MMS: there is no option for it at all anywhere. Not in the text message, picture itself or settings. No 3G: I can't load any web pages/data at all. Then I read somewhere that the -4 build of redsn0w is having problems so I try the previous -3 version: 2. iOS 4.0 restore/install + redsn0w 0.9.5b5-3 then backup of data = still no mms/3g Elsewhere I read that the backup data is what is causing the trouble so I try: 3. iOS 4.0 restore/install + redsn0w 0.9.5b5-4 NO backup of data = still no mms/3g I also tried unlocking it with UltraSn0w, resetting all settings Next I restore it again but play around with it before doing redsn0w. Bone stock iOS 4.0 mms/3g works fine. Without redsn0w I load my backup data back onto it and 3G/mms both still work fine in iOS 4.0. So the problem is definitely happening with the redsn0w JB. At this point I'm going to have to give up on JB'ing my device until a more stable build comes about I guess. Anyone else have problems? Or have a solution?