Originally Posted by
gooselee
Or Google Voice. Or a phone plan with wifi calling. Or a local SIM with reasonable international rates. Or a calling card.
I can use my US-based phone for free anywhere I have wifi. If I don't have wifi, I've never been unable to find a local SIM (which IMO is necessary for any trip longer than a few days) with rates under 5 cents/minute....my usual UK-based SIM allows calls from almost anywhere in Europe back the US for 1.5p/min.
ETA: Also there is a long list of Intl DL phone numbers here. Calling really is going to be the best solution for something like this.
https://www.delta.com/us/en/need-help/overview
This I marked in bold above. There is no reason to not have a free google voice number that you can use to call from anywhere in the world to a US number for free while on WiFi of course.