If you are part of the EU and move to countries that are also part or at least have strong ties your experience on the border can still differ a whole lot.

I've been traveling during high alert corona times where you had to carry extra corona related paperwork or at least that was the official message, but at the border no one even asked for your passport. There were a lot more people at the border but a lot less interest in getting close.

Then at more normal times border agents wanted to know nearly everything about what was in the car. Sometimes you have to drive through a scanner and sometimes they just wish you a happy day or not even talk to you.

It's mostly chance, but no one ever wanted my phone, so far.