IPhone 4 constantly shows No Service

Hi Team,
I buy new iPhone 4 for Past 3 weeks before. But it doesn't work properly, some problem in "Ringer" they (service provider) take 2 weeks(11) days’ time to replace for new one.
Yesterday (28/06/2013) I got the replaced one but my phone have some major problem - it always show "No Service" SIM card is not working.
I buy 2 new Micro SIM and tested it, but both are working in another iPhone & Nokia Windows phone.
I get more frustration with Service provider. Location - India-Tamil Nadu-Madurai.
I can't use new iPhone for 1 month. So I want good working phone.
I Hope this time definitely I get it done.

Hi Jackiec123
Here is my tips,
Step 1 : Download iTunes
Step 2 : Switched off your iPhone(without sim card)
Step 3 : Connect your phone with datacable
Step 4: Connect your iPhone & Laptop/Desktop
Step 5 : Now swiched on your iPhone.
Step 6 : Sync your iPhone & iTunes.
Step 7 : Disconnect your iPhone from your Laptop/Desktop
Step 8 : Now insert your sim card & restart your iPhone
Hope it may help you
Enjoy & thanks for your time with me.

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Reset the iPhone by Holding both Power and Home Buttons together till Apple logo appears.
Restore to a backup.
Backup, Restore in iTunes setup as new.

HT1688 My iphone 3GS is showing no service your network is restriced you can choose a different network in settings ive tried a restore and upgrading software/downgrading still no fix just no service searching...

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Sounds like it's been blacklisted.
Even if it hasn't, downgrading voids any warranty and forfeits all rights to support. You hacked your phone. You can't get help here.

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gUYzz d besT thng u caN do is ...
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click the restore icon in itunes after syncing ua iphone 4s
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Hello aadil_93,
Thank you for contacting Apple Support Communities.
It appears you have done a number of the suggestions in the following article, but there appear to be additional steps there that you may want to persue.
iPhone: Troubleshooting No Service
http://support.apple.com/kb/TS4429
Regards,
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How do i get my phone to work?
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Dear Officer
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Hello hamstersky,
Based on the information you have provided, it appears your iPhone needs to be serviced. The following link should help you get started with the process and has links with additional information on topics such as warranty and service pricing, express replacement service.
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Iphone 4 constantly has "no service"

got an iphone 4, updated on the latest firmware 5.0.1, its currently locked on O2. It was working fine with no problems up until about a week ago, on the odd occasion my service comes back, but even still the connection is fairly poor, and the 3G is temperamental, comes and goes. Even when im travelling through different areas the problem still occurs so it cant be O2 as its highly unlikely that all there network towers are down, for example i live in london, a couple of days ago i was in cardiff, and the problem had still occured "no service". Even still O2 have confirmed there network towers in my local area are up and running. Ive tried various things on the phone itself such as switching carrier to "manual", turning on/off data roaming, mobile data ETC..
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Hi there,
I found a solution for my iPhone 4 with no service!!
I bought the phone about a week ago with a broken screen, so i repaired it and it worked fine!! I then realised it was locked to Vodafone so jailbroke it hoping to be able to unlock it. When jailbreaking the phone it avoided having to activate it which i think caused the issue. Any way ultrasnow haddent released an unlock for 04.11.08 baseband so i decided to just get a free micro sim from vodafone. Once recieved i restored my iPhone to factory default (5.0.1) with the new micro sim in and hey presto it picked up signal just like that!!
So the main point it:
If your jailbroken and your having issues then restore and activate the phone with the orignal carrier sim card!!
Hope this helps some people!

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Please help me.

LOL! - you poor bugger, Ognyan!
I'm starting to serihously think this phone has been jailbroken... I've got a senior technical support advisor at Apple who is working on the case. He has gone through everything he can possibly think of, but won't take "no" for an answer.
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HT4623 why does my iphone 4 keep showing no service in the top left corner ?

have tried restoring it many times, also changing micro sims of different networks and same result....this happened after software update date and got a message through itunes saying ...congratulations your phone has been unlocked !!

Was the phone hacked to unlock it before you performed the restore and got it unlocked?

IPhone 4 constantly shows No Service

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