iPhone 4S dropping network and data at random

not possible:(

google: iOS 5 IPSW Files

I just called Apple Care. The advisor then checked back with a senior advisor and told me that Apple knows that the problem exists and a new software update will be released soon. This update should fix the problem for us.

Strange, i had all the same problems described here.
I also restored, changed settings etc. Nothing!

Now, i ejected my sim and turned the phone off.
Restart the phone without the sim and then i put the sim back in.
So far so good.In the last 4-5 hours i didn't lose my network and can call everybody i want to without the "No service" and reset errors.

Don't know if something is changed but still no drops of the network. Lets hope so.

Maybe something you can try...

Got a second new MicroSIM card, this time from my main operator, and it seems to be working fine as well.

So looks like replacing SIM cards should work.

Operator: MTS-Ukraine

i have same problem with a 3gs... apple should fix this...

I replaced my old cutted sim today with a new original micro-sim (NL Telfort) and my problem is solved......

Good luck to everyone who still have problems!

i have telfort NL too micro sim already and still have the problem

I just get new sim from my carrier (TELE2) and still have same problems. I switch to new carrier (LMT) sim. Now i have no problem. So the result, i have 2 tele2 sim cards, both don't work. And now my new LMT sim, that work fine. Tele2 sim cards work fine in my old 3gs(iOS4) and 2g iphones. So maybe it's just TELE2 don't support my 4s. Or maybe it's apple put something into iOS5 or 4s.

Being a user who has experienced this issue sporadically since purchasing my iPhone 4S (AT&T) on the day of its launch last month (Oct. 14), and after reading every comment in this discussion, I am inclined to believe the root cause of the "data connection loss" to be either an 1) iOS 5 and 5.01 defect; and/or, 2) iPhone 4S modem hardware/modem driver defect.

At times I have had 3-5 bars of 3G signal; though, unable to send SMS messages, send and receive emails, access websites using Safari, and utilize any app that requires an Internet connection. I am able, however, to place and receive voice calls every time this issue arises.

Updating my device from iOS 5 to iOS 5.01 last week (Nov. 11) did not resolve this issue.

I attempted to bring this to the attentions of AT&T and Apple. Both parties have requested that I perform a factory reset on my device, which I have done on two separate occasions, however, without any resolution to this issue whatsoever.

I agree with all of those in this and other Apple Support Community discussions who strongly urge Apple to acknowledge and disclose this issue to its affected customers. Shame on Apple for not only withholding such action, but for wasting their resources and customers' time by swapping defective used iPhones for defective new iPhones.

you cant....but i tried to switch my phone on and off and then i took a sim card from iphone and put it back right away and its working properly now..:)

Hi all,

Had the same problem with missing connection after update to iOS 5.01. Tried everything with no luck.-untill now. I Got e new micro sim from my Carrier- original micro sim (u sim) . Everything is working now.

Who is your carrier?

I'm on Verizon with an iPhone 4 and I updated (OTA) on Monday morning. After my update, my 3G service has been garbage. It comes and goes, disappears completely for extended amounts of time, I don't get 3G service in areas that I did before the update, etc.

It is annoying, partly b/c I'm paying for 3G service from Verizon and now I'm not getting fully what I'm paying for.

Anyone else experiencing the same thing?

Same issue here in Toronto Canada and Fido.

With sim pin off, wifi or 3G signal disappears and comes back.

Happens only on my 4S not the 4 though

Apple you need to say and do something. I just payed 1,049 Canadian dollars. Show some respect for peoples' money.

Thanks.