I believe this is the case in many countries; you can do some work like signing contracts and indeed answering emails and the phone for work purposes, but you c

I believe this is the case in many countries; you can do some work like signing contracts and indeed answering emails and the phone for work purposes, but you cannot just take out the ol' laptop and write code for 90 days. Many people do because you cannot really check but it's not allowed, at least not in places I have been. Especially if you keep travelling (so 2-3 months here, 2-3 months there) then there is very little point in doing all this trouble unless you cannot stand technically doing something illegal although no-one will find out. Anecdotal example; when I was young and naive (well, more naive than now), I went to Canada (Vancouver) to help some guys out with some software. I read up on it a bit, but not enough (naive!) so at the border I told that I was going to do a bit of sight seeing and a bit of 'work'. Wrong word; was immediately taken apart and spent 1 hour explaining that no, no not work, just a bit of light consultancy; no programming, no actual managing people etc and no money changing hands (this was all true, I just shouldn't have used the word 'work'). They let me enter and there were no further issues, but I guess most people would just say 'vacation!' even though this was allowed; it can/does add stress and you might be unlucky and be sent back.