I've bought an Iphone 4S in the UK. Using the phone in Argentina, it displays the "No Service" and "Invalid SIM" errors sporadically. The only solution is to reset the phone (switching it ON/OFF). Any suggestions?

I've bought an Iphone 4S in the UK. Using the phone in Argentina, it displays the "No Service" and "Invalid SIM" errors sporadically. The only solution is to reset the phone (switching it ON/OFF). Also most of the time, the SMS are not sent nor received...
The phone was checked by my carrier (phone company, Movistar) and they replaced the micro SIM card. bear in mind that there's no Apple shop here and the Iphone 4S is NOT available in Argentina!!!
Any suggestions?

Dear all,
(THIS CONCERNS MTC TOUCH CUSTOMERS IN LEBANON)
I've received an email with a solution to the problem; you have to update to the new iOS 5.0.1 firmware (9A406)!! It's been 1Hour and so far my iPHone 4S is working just fine. Please follow carefully the below instructions:
RUN A FULL BACK UP BEFORE DOING ANY OF THIS
1. Download the new iOS 5.0.1 firmware (9A406) from the internet. (800MB)
2. Connect your iPhone 4S to iTunes.
3. Once connected, two options will show: ‘restore’ and ‘check for update’.
4. Press down SHIFT and choose ‘check for update’. (if you click ‘check for update’ without pressing down SHIFT doesn’t work.)
5. Select the new firmware (9A406). Note that the file should be renamed ‘iPhone4,1_5.0.1_9A406_Restore.ipsw’  (instead of ‘iPhone4,1_5.0.1_9A406_Restore.zip’), i.e. changing the file extension from ZIP to IPSW. iTunes will now work alone and update your iPhone 4S.
A full back up is recommended before firmware upgrade.
HOPE THIS HELPS

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