Help with unlocking Samsung A117

Can someone please help me? I have a Samsung A117 which was - or is - locked to AT&T. I have followed instructions to unlock - which I THINK has happened though on powering up the phone, it still shows AT&T but it does not indicate 'WRONG CARD' with a different sim. However, I can't get a network coverage. When the phone went to interrogate function, it did show Network Lock - Deactivate. I should mention when I tried to type 'O', I got a '-' in its place and now, if I try the codes again, as soon as I type the second * in the code line, I similarly get a series of '-' instead of the required numeral, eg 3. I have tried different SIM cards but still am unable to connect to a network.

Please help.

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Call your provider and activate the phone