@cowgirl836 did you go international plan for your phone when you went to Scotland?
It seems spendy. Someone told me about WHatsApp, but I'm unsure if the person you're communicating with has to have the app as well or not.
I just used wifi for mine - DH got a local SIM card and a couple gigs of data. ,I want to say it was about 30, but not sure. Because we needed to use our phone to navigate (GPS) as well, that's why we got the SIM. Was also useful in areas that didn't have great wi-fi. I would recommend it for longer trips. But if you are going for less time or with a group, probably not needed. We didn't use it for Montreal.