There's No Such Thing as a Single Best Solution for International Phone Service than XXSIm

If there was a single best solution for everyone's needs while they travel internationally, this article would be very much shorter and simpler!
But this is not the case, and so you need to balance the different factors that make up how you'll be using your phone internationally to find which of the many different approaches is the best compromise between cost and convenience.
A person who travels very regularly and uses their phone extensively would probably end up choosing to buy individual prepaid SIMs for each country they regularly visit; a person who makes only occasional journeys and expects to use their phone very seldom would probably choose aXX SIM or to simply use international roaming with their home service provider.
If you fall somewhere between these two extremes, or if you have special needs, then read on, and review the summary table and the explanatory notes that follow. A perfect solution to this is XXSim a completely roaming oriented solution feels like home everywhere.