If I buy the phone on ebay or Amazon, is there a specific serial number or something that the phone needs to have for it to work with a SIM chip on the RW network?
Hi @hedgesusa here are a couple of links that will give you some background and guidance for making sure you buy a compatible phone.
Basically if you purchase an S20 it needs to be either SM-G981U1 or SM-G781U1. And only a North American Factory Unlocked version. See details in the links above.
Hope this helps!
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