Pre-paid phone - who is my carrier?

My son recently found his old pre-paid phone. It disappeared into one of those black holes that sometimes appear in teenaged boys’ rooms. Now that it is back, I would like to buy some minutes for him… but no one can remember what service this phone uses. And poking around I can’t find anything in or on the phone itself. I have a phone number, a serial number, and a SIM number but nothing else. I tried to use net10 thinking that might work… but no dice.

So is there a lookup service, where I can figure out who this phone is through? Or is there some other way to turn this thing back on?

https://www.carrierlookup.com/index.php
or
http://www.smsmatrix.com/?num_lookup

Thank you. That did the trick.

Did you check with the carrier? After I posted that I was remembering that carriers re-assign phone numbers if they are not used within a certain period of time.

Spam reported.