The Minutiae of Moving Abroad- Banking, Phones, Etc

Hi Everyone! My wife and I are moving to Portugal in a few months and both the excitement and stress of the transition are going to amplify by the week. Our goal is to live abroad for at least 2 years (ideally 5+ or indefinitely). My brother will be renting our home for the long-term.

We are going to work with a relocation company for many of the big picture items (visas, relocating the dogs), but I'm curious to hear from the community on the little but important details, like cell phone plans, banking decisions, and misc things that are slipping my mind.

For people who have made the big move and already live abroad (congrats!), do you have any recommendations and/or regrets to share from personal experience?

For example, do you regret giving up your US phone number or do you wish that you cut the cord and just embraced Whatsapp? Or did you stick with your current bank because it was "easy", only to realize that it would have been much easier to switch to another bank with better international policies?