iPhone 4S dropping network and data at random

When will this be fixed? I work up with my phone showing "Invalid SIM card" This is extremely frustrating!

This is more than fustrating. Imagine i paid so much money for a phone and i cant even recieve a call. Im ashamed to tell people this. Any word from Apple on this problem?

i'm from Philippines and using 128k sim provided by my service provider Globe. i also have a new iphone 4s which was originally working but when i updated to 5.0.1 the signal or network connection keeps dropping. the solutions posted by several people here are just temporary coz i've tried them all and still the problem is the same. APPLE has to make a new update to correct this all.

I forgot to mention that my 4S has NOT been upgraded to 5.0.1.

It isstill running 5.0 but did show the No Service until turned off, then back on.

So, maybe the problem exists in 5.0 marginally and gets worse with the 5.0.1 upgrade?

This has only happened one time, so far.

I have tele2 in Sweden with the 128k sim, but still no success.

Seems that was not the issue after all, even though some people claim

It solved their problems

That's really bad news for us with Tele2 in Sweden. It seems like a solution is far away right now. How can I see what SIM-type I've got?

I've never been more disappointed with Apple than I am right now.

How can a phone priced this high not work properly?

@hejo82

Ring kundtjänst och fråga, men om du nyligen fått ditt simkort

så är det med största sannolikhet redan 128k

I can't make calls. I can't recieve calls. I can't text. I can't recieve texts. The phone constantly hunts for signal. This is not an iPhone. It's an "iCan'tUseItPhone" Not only is my phone absolutely useless. Here's another issue with the 5.0.1 update. My iPhone 4 or 3GS would immediately display "No SIM" if you remove the SIM. Yet my 4S shows signal and a provider. Makes me think of what the "S" in 4S stands for. **** perhaps....A little help here Apple.

Same $#%@ here, without sim it shows signal.

But i can recieve calls and texts, but when i try to call, it drops signal and start searching it and after some time i can make 1 call or send 1 sms, and then @#$% startin again.

And also after, i don't know, maybe 5 hours it says SIM failure, invalid sim and only reboot helps.

It worst iPhone yet.

got a new micro sim from the provider and the problem solved!! its working perfectly fine now:D

Same thing here. It's that **** IOS 5.0.1 Everything was fine on 5.0 except battery drainage but now I wish the problem were only battery drainage! I think Apple is trying to tell us something. Don't **** with us or else! It seems that many people are desperate for solutions even switching to 128k SIM's which I find it hard to believe solves anything since my SIM works just fine in other phones. It's definitely a software issue or all the times I told Siri to shut the **** up. I think she's ****** and is on the path to vengeance.

I think this might work out

First off

Go to settings ,

Just after location services there is carrier settings - open that

Switch off automatic and select your sim carrier

That's all check if that works

i live in cairo and i am using vodafone and i keep losing my network every 15 min since i have done my update on the iphone 4s to 5.0.1 and it says invalid sim and i have to reset network every time then it works for a bit. any news???

cure is 128k SIM!