yes u can by preserving ur baseband by using umbrella and updating to 4.1 since u have an iphone 4

QUESTION:
I restored my iphone and had previously bought apps from Cydia. Of course I don't remember their names how can I find out what they were?

not true.... being out of service for while or a matter of 1 min I get no service either. Mine looses service when obviously i am in the elevator and never "re-gain" service when I am out of the elevator. Like KRIM I have to switch on/off the phone a couple of times to get service. Sometime it doesnt work from the first try... Me too airplane mode doesnt help either. I KNOW FOR A FACT ultrasn0w has a bug and I SURE do hope the dev team read the forums here and are aware.

you're not the only one... I am experiencing the same thing as well. It's FOR SURE a bug in ultrasn0w I HOPE dev team i working on it.

You're not the only one I am going through the same as well. my internet connection works and all of the sudden stops for no reason. I have to eject the sim cad and put it back it to make it work... its a pain! there is Definitely a bug in this Ultrasn0w. I hope the dev team are working on an update!!

asking amateur questions is not helping.
I was pretty clear from my first post. You don't like the topic or my way of posting move on...

of course not wouldn't that defeat the purpose of Jailbreal/Unlock an iPhone? I've owned everyone iPhone since the 2G and unlocked them. This is is the first time I encounter this. I know for a fact there is a bug. My mom's 3GS is doing the same as well.

It always says: Carrier 7.0 Something else to mention: Somtimes when I turn off my phone and turn it back on I get no service AT ALL. I have to keep turning it off/on until I get service. I usually see the following error code: NO SERVICE, INVALID SIM, (one bar with no service name). This again is the case with both sim cards

my sim is not cut... BOTH are issued Micro Sim cards from both companies....

I am having the same issue as well... Somtimes when I turn off my phone and turn it back on I get no service AT ALL. I have to keep turning it off/on until I get service. I usually see the following error code: NO SERVICE, INVALID SIM, (one bar with no service name).