That sounds as if the phone had not been activated (or, after several years of disuse, re-activated.)
Did you put the SIM card back in properly? that could also cause such a condition (unless of course it was that way before the SIM card was taken out! I understand that.)
If it's a Go phone, then you may have to re-activate it after several years of disuse. For activation status to lapse after a time might be considered perfectly normal, if bothersome... a number that is unused needs to be re-allocated, since there are only so many numbers to go around.
Go to this page, enter your SIM card number in the form, and proceed from there:
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