My sister-in-law is visiting me. She has a Windows phone (Nokia Denim model RM-1017). It is connected to my home WiFi network. But I can't work out if and if so how I can call or send SMS messages? (I can do this easily with iPhone and Android.)
My sister-in-laws contract does not allow roaming; she lives in the UK, and I am in Ireland.
I looked quickly on the web for a solution, but all I found were apps to do this. Does she really need to install an app?
Any advice gratefully received.