Updated to 5.1 this morning .... So far so good.. 8hrs now...all calls goin thu in the fist attempt...getting incoming calls too... Cheked in low signal areas also...it is able to latch on the signal with out any problems ....keeping fingers crossed ... Should not get invalid sim tomorrow morning.
I have updated to ios 5.1 this morning and its almost 8 hours already that i haven't got the "no service" error except when i tried to switch from automatic network detection to manual unlike before where-in within 2 minutes after restarting, resetting network settings, the "no service" message come right away. Hopefully this really solved the issue, will monitor tomorrow morning if i will not see the "invalid sim" message. will continue monitoring and will share whatever the outcome is... for 8 hours so far, my iphone worked as it should - a phone, unlike in the past month where it was an expensive ipod touch 4s.
As i said and promissed to see the change 2 weeks ago no need to replace your phones just update to ios 5.1 you will get long battery life with 3G off and you will get amazing network with no problems check my old posts 2 weeks ago when i got 5.1 B3 and some guys here keep saying replace the phone it's hardware failure the truth it's not just the ios 5.0.1 had modem driver issue with the phones hardware any ways all problems fixed now enjoy your 4S phones guys .
Almost 3 weeks with ios 5.1B3
0 invalid sim issues
0 call drops
0 network problems
200% more battery life
and now using the last new 5.1 full version i got the camera shortcut in the locked screen this is the only new change coz i had 5.1b3 since few weeks and all my problems fixed .
here is some tips if you still get the problem after the update to 5.1
-Don't update your phones from setting system update tab use itunes to backup your phones then download and install the whole new ios 5.1 702mb not only 100mb that you got in phone update then restore your data and everything will be ok.
here is my battery life print screen image with 3G off and wifi on below
well, ios 5.1 solved some of my problems. i am sorry to see that it didn't solve at least some of yours..
i have bad reception in my home, and with this update i am now able turn off 3g, and because of that i have at home full bar signal for the first time ever.. when i am at home i turn on wi fi and i'm using my home network for internet connection.. when i go to the city, i turn on 3g and there i have normally good reception..
as i say some of my problems are solved, but not all- i still have pure battery life. i think, in your case, you should go to apple store and change your device for new one.
I had the same issues (no service, battery life issue, invalid sim, network searching etc..). my iPhone 4s was purchased from Saudi Arabia. and i have faced the same issues discussed in the post. last week i hav updated my ios. (5.1) now all of my issues have been solved.
So i advice dont do restore, dnt do change ur sim cards .... just try with new ios 5.1
Threads have gone more quiet after iOS 5.1?
So, does the 5.1 update really fix the "call failed/call failure/no service/searching"?
I have been waiting, and I've hoped that the iOS 5.1 actually fixed thos issues!
After the update, I've god two "call failed/call failure/no service/searching"...
So I guess it's hardware fault anyway!
Have to send it back to Apple, again... to receive my 3rd iPhone 4S.
Apple, we love you!
Here you can find your date of manufacture : http://www.chipmunk.nl/klantenservice/applemodel.html/
Type your serial number and you will have this information and other. Example for my iPhone :
Serial number: .................
Name: iPhone 4S
Machine Model: iPhone4,1
Model introduced: 2011
Production year: 2012
Production week: 2 (January)
introduced test: GOED
CPU speed: 800MHz
Family name: Become a pro user to see this information. (sorry)
Screen size: 3.5 inch
Screen resolution: 960x640 pixels
Factory: C9 (China)