So, as the thread title says I have the problem that my cellular data does not work anymore. I was on a jailbroken 5.0.1 for a long time, then last weekend when the untethered jailbreak for the 5.1.1 came, I updated to that and applied the new jailbreak. Did this over the weekend, then Monday morning on my way to work on the train noticed that my 3G is not working anymore, the entire icon next to the carrier name is gone. Ive double and triple checked that the cellular data network settings are correct, re-setted them and entered them again etc, and no luck. As I thought that maybe this is a problem due to 5.1.1, I went and downgraded back to 5.0.1 today with redsn0w, but the same thing - I don't have cellular data anymore, the icon is not there, nor does it work when you try to use Safari etc. Any ideas what could be wrong? Could it be that something has broken hardware wise? This is driving me nuts, as without the cellular data this Iphone is half useless, and now that the downgrade didn't help either, I have no clue what to try next. *edit* and also since the cellular data stopped working, I cannot either send any SMS. Can receive them though. Any and all help would be greatly appreciated!