iPhone 4 constantly shows No Service

Hi guys, I have iPhone 4 16 Gb ( Maxis Pre-Paid- Modem firmware 04.11.08- Original IOS and no jailbreak) I had the same issue started when

I didn't have any issues with IOS 4.3.3 until a friend told me about IOS 5

I upgraded to IOS 5.0

I had intermittent problem of getting no service ( or having the signal and maxis logo but no call could be made or received and sms also) when I moved to Bukit Jalil and returned back to serdang and first I thought it is because of service provider. At first It was getting ok by a simple reboot.

The funniest part was when I called my friend next to me his phone was ringing and I coudn't hear anything (dialing tone) and I coudn't hang up like the phone was in a problem. I had to kill the task with task manager. Even friends called me without even the phone to ring for a single time, and they thought I wasn't answering the phone.

Then I upgraded to IOS 5.0.1 and I thought there it is, that is the fix but no luck, I upgraded to that without using iTunes. Problem persisted and I reinstalled the IOS 5.0.1 with iTunes and there was no luck.

I went through many posting which suggested me to change the sim card (mine is cropped sim cardto micro sim card) and I went to maxis center and they refused to do so because of no reason. They said they have recieved nomerous complains.

Two days ago I lost signal ( Maxis siganl was there but I was unable to receive or make calls receive sms or send any ) and resetting it many times didn't help.

I tried to restore the phone to original factory setting and it worked for 1 day and returned to its chrinical problem just now.

What I did this time was to enable cellular data and disable it and it solved the issue even without restarting it.

If you guys have this issue try this one as it saved me from smashing my lovely iPhone 4

Hi. i'm from Czech republic. i have iP4S. Buy it in T-Mobile store in Czech. iOS5 working with no problem. But when I made an update to iOS5.0.1 it start problems with signal. Many times a day i lost the signal. Restore, restart nothing repare this problem. I'm using Czech T-Mobile SIM. I call to T-Mobile and they said i must waiting for iOS update. I call to APPLE and they said that they know about it, they are sorry becaude some T:Mobile users in Czech have problems with this version of iOS and they said We are sorry, but you must wait for iOS update. Have a nice day. iP4 with the same version iOS works normal. Than i used SAMSUNG GALAXY2 Im sorry

i have the same problem with kian wei before and i have change the new sim card for my maxis but still cant solve the problem. eventually download the new IOS5.0.1 via iTune and restore as factory setting and restore my data back using my icloud account. everything resolved.

You may need to observe whether this will happen again. I did eaxctly the same thing like you via re-download through iTune but the problem still re-occured.

Hi .... I am experiencing the same thing .... my carrier is also Maxis from Malaysia. Its been happening to my phone for 10 times now today. Same symptoms ... No Service then i will not be able to recover the signal. I had to turn off and turn on my phone each time it happens and its getting kind of annoying. I have'nt tried turning on and off the cellular data yet though ... hope it works.

It happen again today in the middle of the call. Previously the problem happened when the phone was idle. So the conclusion is this problem can happen anytime anywhere 😟 Stupid software

Issue seems to have stopped occuring for my phone. *touch wood* and hope it stays that way.

Cellular data has always been off.

Few days ago, I connected to iTunes and there was a carrier update.

Try and see if it helps..

http://support.apple.com/kb/ht1970

Now try ur method hope can solve it. Thank you .

I have had the same problem, but just recently for 2-3 days. Started with phone freezing up and quitting on me and now it keeps going back and forth from searching to no service. Then it will show full bar and still drop my calls. I think it's an iPhone issue not a carrier issue. I'm in California and have AT&T

I mean the call just ended in the middle of the call & I have to enable & disable the cellular data to get the phone back in working condition.

Fyi I have the lastest carrier update (Maxis 11.1) before the problem happened. So the carrir update is not help.

I spoke too soon, carrier update does nothing to resolve the issue..

The same thing is happening here in Ireland on O2 network... definitely an Apple bug.. a phone that says "No Service" but it rings when people call it and you can call people but you can't here them... it is clearly not fit for it's purpose and a breach of contract from Apple. I am contacting the telecommunications ombudsman and the government to find out what avenues are available to me under consumer rights and legislation... this is not acceptable.