Would it be best to have a duel sim card phone or is the E sim card enough

Keeping US Number -

Hey folks, coming over for good in October - I need a US number for ONE reason only - 2 factor authorization!! Literally every day, for banking, Paypal, government, practically anything I log onto here, they send a text to my US number so I can log in. Of course I will have a VPN when I arrive, but how do I keep a US number [JUST to receive texts, won't be making or receiving calls with it!!]. I will keep my phone from here, and buy one there with a Thai number - how can I go about making/keeping this one as my "US phone''? Thank you