Thanks, that's what I thought. I know there is the option to make this work with a dual sim phone, but I'm planning to just get a separate phone for Thailand with DTAC or another local provider and keep my US-based phone as wi-fi only and stowed away until needed. The new, local phone/number would become my daily driver for calls and local apps and it wouldn't be a disaster if I lose it or it drop it, etc. I don't think I'll need to buy any international roaming on Mint under the wi-fi only scenario for the old phone. As far as the other info here, I will look into textnow as a backup option. Others mentioned Ting, which does appear to be a bit cheaper than Mint, at least for limited data, but not enough for me to switch at this point. Thanks all for the helpful info!