I think you answered my question. I recently installed my island number on my iPhone and turned my Verizon number into the “Digital E-Sim”. So I only need one phone and both numbers are on it. I’m assuming if I turn off “cellular data” for Verizon, it won’t trigger the 10 a day. But calls and texts can come in. And I just need to respond when on WiFi if I don’t want to get charged. But if I answer an incoming call on my US number there also won’t be a charge. For outgoing. I just select which number and dial. .