Normally I delete these sorts of threads but I will make one assumption here and let this pass - that this is your phone, and not stolen.
On the SIM there is a provider (network Provider) Logo or name.
Contact the network provider for the SIM, state your serial, and provide your name and address.
They will then make a check, and restore your service after a couple of additional questions.
I find it hard to understand how you do not know your number?
This is the first and last thread of this type I will approve.