iPhone 4S "no service" problem

Actually i was investigating more about this issue today and went myself to all network gsm providers in my country and what i discovered is that the main cause is behind sim cards wiring techniques. some sim cards are wired in some way that can cause a security conflict on the new 4s ( mainly old 64 k sim cards and some few 128 k sim ) causing the phone to disable the network signal. i dont know if it is done by purpose from apple or not. actually you must change your sim card and give it a try. and actually my problem wasnt fixed completely since my network provider still refusing that its a sim issue and are not planing to deliver new sim cards for the near future, while other operators at my country deliver the new wired 128 k sim and i tested more than 5 sims on my iphone 4s and they worked completely without any issue. im like you completely dissapointed from apples decision and from apples hardware and firmware. hopefully they release a firmware update soon because in the mean time i cant use my 4s and im using a 4 years old nokia n78 that is still working untill now.

José Cimillo, estou com o mesmo problema. Minha operadora é a TIM, a sua também?

Já troquei 2 microchips e o problema continua. Alguma idéia?

iPhone 4 stopped working yesterday with same issue: phone loses service & shows 'searching' literally every 30 seconds, acquires a signal, drops again...... I turned off Cellular Data and the network was fine. Finally realized iCloud backup uses Cellular Data network. I turned off iCloud and turned on Cellular Data, and that seems to have solved the problem.

never mind... it worked for a bit and now back to No Service/Searching. Only temporary fix is turning off Cellular Data.

Também já havia tentado 2 Micro-SIM. Resolvi o problema ontem, troca teu Micro-SIM por um de tamanho normal, corta com uma tesoura pegando o Micro-SIM como referência (o local onde vai ficar a placa metálica tem q coincidir com o local onde fica a do Micro) e pronto! Fiz isso ontem, tá funcionando perfeitamente. Boa sorte aí!

EDDERGHAM! You´re a genius man! I changed my Micro-SIM for a regular one and hand-cutted it, works perfectly! Thank you a LOT! You can´t imagine how happy i am with my iphone now.

I have tried this here in Brasil. Didn't work, tried again... same problem. I really don't see a solution until TIM upgrades its network or Apple launches 5.0.2 adressing this issue which is not only with TIM Brasil but with many other carriers around the world.

I did the same and it worked! Just cutted a regular 128k sim card from TIM Brasil, put it on my iPhone 4S and everything is working now! Thank you EDDERGHAM!

UPDATE: Well I have just had my iPhone 4s replaced at the Apple store, I will let you know if I still have the problem with this new handset.

Finally I found the ultimate solution

follow this discussion and give me your feedback if it works or not

https://discussions.apple.com/thread/3525977?tstart=0

Actually i had the same problem too. My iPhone 4S kept losing the signal after I installed the latest iOS 5.0.1.

I need to turn off and on my phone every half an hour as the signal will disapppear and the phone showed 'No Service'. I was utterly disappointed with iPhone right now. What's the point of spending so much money to get this piece of nonsense?!?!

I have been using the 128kb simcard and i cut it myself just for my iPhone4S. Does anyone know if that doesnt solve the problem, what might be the cause?

Should I get it to Applestore to change another one? But I heard ifyou bring it to them they will only change an old one for you, not really a branf new phone. I m so frustrated right now. Any advice?

hi guys,

i recently bought a new iphone 4s factory unlocked. in order to avoid sim failures and invalid sim errors or No service errors, Each phone has to be unlocked by connecting it to the Itunes.

Kindly follow the below steps to avoid any SIM card conflicts

iPhone FULL Unlock - How it Works:

-Connect your iphone to itunes without any network sim inside and when connected click on the iphones name.

- Click Restore install latest version of iTunes on your Pc or Mac or click check for updates

- Let itunes Backup your phone and then Flash to the Latest Version.

- Now disconnect phone and reconnect after 10 seconds.

- Now Enter another network simcard that's not the same network its locked on to

- Connect phone to iTunes with not accepted (not valid) simcard

- Wait until iTunes detects the phone

- iTunes will display (Congratulations, Your iPhone is now unlocked)

- Phone Unlocked

- just follow the instructions about activating the Iphone.

and iphone is unlocked 🙂🙂🙂

NOTE : This is the only FULL LIFE TIME UNLOCK solution for Apple iPhone as the IMEI is registered as UNLOCKED in Apple database.

This solution should be used ONLY THOSE WHO BOUGHT FACTORY UNLOCKED iPHONE 4S.

Your phone will always be unlocked even after each new update of your phone firmware !

All reasons given like bad IMEI series, manufacturing defects etc blah blah are not logical as everything was tested before every sale.

hi guys,

i recently bought a new iphone 4s factory unlocked. in order to avoid sim failures and invalid sim errors or No service errors, Each phone has to be unlocked by connecting it to the Itunes.

Kindly follow the below steps to avoid any SIM card conflicts

iPhone FULL Unlock - How it Works:

-Connect your iphone to itunes without any network sim inside and when connected click on the iphones name.

- Click Restore install latest version of iTunes on your Pc or Mac or click check for updates

- Let itunes Backup your phone and then Flash to the Latest Version.

- Now disconnect phone and reconnect after 10 seconds.

- Now Enter another network simcard that's not the same network its locked on to

- Connect phone to iTunes with not accepted (not valid) simcard

- Wait until iTunes detects the phone

- iTunes will display (Congratulations, Your iPhone is now unlocked)

- Phone Unlocked

- just follow the instructions about activating the Iphone.

and iphone is unlocked 🙂🙂🙂

NOTE : This is the only FULL LIFE TIME UNLOCK solution for Apple iPhone as the IMEI is registered as UNLOCKED in Apple database.

This solution should be used ONLY THOSE WHO BOUGHT FACTORY UNLOCKED iPHONE 4S.

Your phone will always be unlocked even after each new update of your phone firmware !

All reasons given like bad IMEI series, manufacturing defects etc blah blah are not logical as everything was tested before every sale.

I had the same issue (no service, invalid sim, searching...)

I did install iOS 5.1 (developers only) and everything looks fine now.

BRAZIL - TIM

iPhone 4S 64GB

iOS 5.1 (9B5117b)

Model: MD257C

Serial: C3.......

IMEI: 01 300....

Firmware Modem: 1.2.01-1

SIM 128k TIM carrier (cutted sim and micro-sim working)

SIM 64k VIVO carrier (cutted sim working too)

🙂

Tks Apple

PS: Sry my english

Forums are really helpful.

My iphone 4S is from Canadaand unlocked, worked fine in north America but once I cameback to Dhaka Bangladeshit started to act as others have mentioned. I though the SIMwas bad so picked up new micro SIM fromGrameen and obviously nothing changed.

Iphone 4S detects network and drops intermittently, goes tono network or unsupported sim mode then comes back again after restarts. In settingsmy number is unknown. Fails to send text or messages and to my frustration goesto no network mode and stays in the no network mode cutting me off from theworld!

I switched back to my old iphone 4 with the same sim andtried the same micro sim in 3GS (by putting the sim back on the originalstandard size sim from which it was broken off from) no problem at all, worksfine and never goes out of network.

There must be a fix for this I am really getting frustrated.

I’ve done all the recommendations for solving the problembut its not working:-

• - removing the PINlock
• - resetting the iphone and setting it up from backup
• - resetting the iphone and setting is up as a new phone
• - replacing the sim
• - using a different sim which is a cut sim from aoriginal older version
• - selecting the carrier manually but have done it fewminutes ago so really can’t say what is happening.

Apple wake up and please try to fix the problem