HT1688 removed SIM card from an old iPhone to use it as an iTouch.To clear all data from device restored it. Now it requiring SIM in order to activate it. don't have SIM anymore. What can

I removed the SIM card from an old iPhone to use it as an iTouch.

To clear all data from the device, I restored it.

Now it is requiring a SIM in order to activate it. I don't have that SIM anymore. What can I do?