I'll be traveling to The Netherlands, Czech Republic, and Hungary next month.
With my previous phones I've always kept them in airplane mode and just used wi-fi access at hotels when I had a connection.
This trip I'd like to be able to make phone calls.
Mostly to be able to call my Dutch traveling companion if we get separated and need to contact each other.
I'm assuming I can use my S7 without having to replace a SIM or anything.
What is the travel plan I need and what do I need to be aware of to not get a high phone bill after my return?