Originally Posted by
lamphs
More importantly, are you stating that you use US AT&T, switch to a SIM/eSIM when traveling outside US, turn on wifi calling and still receive SMS to your US # without the $10/day AT&T charge?
Yes. Several threads in the technology forum discuss IMS using a dual sim iPhone. The phone has to be carrier unlocked. The WiFi calling feature includes text messaging. At one time I carried an extra phone with a local sim and hotspot enabled to use my iPhone in WiFi mode.
A few Android phones have similar capabilities.