Search is your friend - see below post with a list of US Telcos - Verizon (and as a result Twigby) is not supported on BraX3 (or rather, as I understand, Verizon is too hard for BraX3 to get “approved” for it’s network) - so not likely to get stable connectivity:
I assume you meant a Pixel 6a in your first sentence - you might be able to spoof the IMEI from that on the BraX3 to get the SIM to work in it - but not sure if it’d be worth the hassle?