iPhone 4S drops 3G, have to restart phone to get it back

Have you tried to turn off SIM PIN?

I did but made no difference. Also this increases Security risks so its not a viable solution.

i'm having the same problem, going to have to switch mine out, has nothing to do with SIM pin

Same problem but its obviously a software bug the iphone cant decide wich antenna to use and it bugs out i have 2 4S and they do the same thing just be patient and wait apple to update to 5.1 bcz its probably related to battery issue too... I'm pretty sure its software related

I have had this issue going as well. I'm glad to hear I'm not the only one experiencing this problem.

Hi All I had the same issue. I brought my iphone 4s back to an apple retail store where i purchased it. they replaced it and viola - my phone stayed on 3G always... live in usa central region

it is the iphone 4s not the software program... it was stuck on E which is the 2g network always...

after replacing my iphone 4s with a different one - 3g always

thanks

Im pretty sure its the software 2 of my friend has the same problem... And they are on bell and i am with fido in canada ... It just cant decide wich network use ...

I forgot to mention my carrier is at&t and they told me if I had an iphone 4 prior and updated to iphone 4s they needed to provision my iphone 4s for their new network.. when they did this my 3g speeds increased tremendously.. so if you have at&t I would suggest you call them and see if your iphone 4s is provisioned for the new network speeds.

Mine looses signal when I run any location aware apps like google maps. Ex.. I start google maps and input an adress and it finds it, but after a couple of seconds my phone drops 3G signal and I get a searching for signal message. If I leave the app running in the background and try to make a call my phone call drops. The only thing I can do is disable location services.

Finally I went to the apple store and they exanched my phone, I reserved one, we will see if the new one doesnt have any problems...

I get new simm my operator and that fix my problem.

I think my iPhone 4S was a DOA device and I am waiting for a new replacement iPhone 4S this week. There was a possible battery problem, too.

As a test, I put the sim lock back on. After literally a few minutes it refused to send text messages and then said No Service.. so I took it off again and now works perfectly again.... It is bizarre that something so silly can make such a difference to the phone...

Apple are sending me a replacement so I really hope the same thing doesn't happen. Especially as I have to refit both front and rear Iphone protection films... and bumper!

I have the same problem here in Kuwait with the zain carrier.

People who have the regular IPHONE4 have 3G all the time and though I'm right next to them

I only have edge. The same problem has been reported at many places. Seems like apple needs to

Update to 5.0.1 ASAP. This never happened when Jobs was around.

Ive been having this problem for 2 weeks now since updating to iOS5 and am not impressed with how apple is handling the situation. We are getting absoluetly no feedback from apple on the problem, and i dont want to go to a apple store thats 2 h away from me.. and if they do replace it, give me a refurb unit. Ive pampered my phone since ive gotten it and its been awesome untill iOS5. ive done 3-4 restores (tried all the different methods that were explained on the site (do without the sim inserted, try a older restore, different pc, turn off location services, etc) , and the phone works great for 3 days, then the searching... no service problem begins.😠

Im just dissapointed because i payed full pop for this unlocked phone right from the apple store.

Google Nexus S here i come.