Can i just take out my SIM card to erase my passcode?

i Have forgotten my passcode and I haven't synced my phone to a computer, so can I just take out my SIM card to erase it all and start from scratch?

Nope.  You will need to restore the device from a computer.  whether you've synced to one in the past or not is irrelevant.
Use iTunes to restore your iOS device to factory settings - Apple Support
Removing the sim card will simply stop the iPhone from getting cell service. nothing more.

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