Nope, you won't need a new SIM. On GSM you can just move your SIM card from the 6P over to the Pixel 3 and it should pick right up where you left off.
New Pixel 3
I'm on Ting now with a Nexus 6P using GSM. I want to upgrade to the Pixel 3 and stay on GSM. Do I need a new SIM card?
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