Depends on your iPhone model . You can have dual sim with the newer models of iPhones as Apple explained here :
Set up and use Dual SIM.
support.apple.com
And it works too . My old iPhone XR has a UK SIM card + US eSim …Miesposa’s iPhone 13 has a Dominican SIM card and eSim from one other country.
An eSIM is a digital SIM that allows you to activate a mobile data plan from your network provider without having to use a physical nano-SIM. Find out which wireless carriers in your country or region offer cellular plans on an eSIM, either activated by eSIM Carrier Activation, eSIM Quick...
support.apple.com
DR is not on this list of wireless carriers that offer eSim technology…but I’m sure it will be soon seeing that Claro in other countries in Latin America are on board.
I will test drive 2FA on US eSim when I’m back in DR.