Why am I unable to connect to GSM network? Possible hardware problem?

I am unable to connect to GSM network. SIM card works (checked it in a friend's similar tablet). When searching for available networks i get the list of networks. I select my network, the tablet spends 40-50 seconds attempting to connect and at the end i get the message "UNABLE TO CONNECT" Signal bar shows 5 lines (full signal). I have the latest software installed and all settings are correct. It used to work and then suddenly stoped. No SIM card on any network works. Is it a hardware problem? Has anyone encountered a similar problem? Have you got a fix? Thanks

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