How to factory reset a disabled iphone 6 without a computer and can not hook up to itunes

Question

This phone does not have a sim card in it

Answer 1

After you got a message that your iPhone is disabled, you need to put it in DFU or Recovery Mode, and Restore it via iTunes. Your data will be erased, but the phone will be restored and can be used like a new one.

You can follow the detailed guide here: https://support.apple.com/en-us/HT204306