I will be driving around in Europe for 3 weeks, in major cities and smaller towns of Germany, Luxembourg, France, Austria, Czech Republic, Denmark and possibly Netherlands and Belgium.
I need local calling, calling within the EU, and calling to and from Canada. I'm not a big SMS user but it is helpful. I will use my phone for maps so I'll need a good pile of data. My phone is a Canadian unlocked Samsung Galaxy S7 Edge. I will rely on WiFi where I can but it is more important that I get good reliable 3G/4G coverage than a low cost. I want to land in Frankfurt airport and shortly after that go to some close-by store and purchase the SIM and have the clerk help me get it correctly registered and setup.
I see lots of info on France and Germany, but obviously I need to cover much more of the EU. What do you recommend for the best Network / SIM to purchase?