Unfortunately right now isn’t a good time to be using Sailfish in the US as a resident or traveler. Yesterday T-Mobile shut down the last of the 3g networks here and so all Sailfish phones except the 10 iii lost voice/sms/mms service. LTE enabled shellfish devices should still be able to have data access so using an android voip app may be a work around (but still don’t allow you to receive calls or texts on your primary number).
10 iii drawbacks: no band 12 support so, limited coverage outside of urban metro areas. MMS isn’t working for some people.