Iphone 4s always searching for network

Hi All,
I already tried the article that have suggested about
iPhone: Troubleshooting No Service
http://support.apple.com/kb/ts4429
but it doesn't solve the problem. I even tried to restore to factory setting and replacing the antenna but still the same problem " always searching for network". I referred this problem on 2 repair shop but they said it related to motherboard. Is there service center for apple in Singapore or Philippines? What would be best thing to do for my current iphone?

You'll have to contact your carrier to get it serviced, copied from the iPhone service center for Singapore:
Out-of-Warranty Service
Please contact your carrier or an iPhone Authorised Service Provider for Out-of-Warranty Service Options

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