While international roaming is not being offered as Public Mobile is a pre-paid service, how realistic is it to set up an app that will allow us to use call and/or sms features over wifi?
It may be simpler to set up compared to negotiating agreements with foreign carriers. This could also meet some of the basic phone needs of PM customers while travelling abroad. Those with a dual-sim handset can keep their PM number active while using data from a local sim in the second slot.