That is not true for Spain. Since the attacks on 11-M 2014 in Madrid, it is mandatory to provide in the local shop your National ID card or passport to activate any SIM card. But the verification is done by the shop attendant.
Anyway, I do think it is pointless as there are plenty of ways to get a SIM card anonymously: buy it in other country, steal it, buy it from somebody, clone it...
Yes, I do use git pull --rebase constantly when pairing. If everybody uses it, no problems, just simply works.
I have been seen only issues and completely messed up git histories when some other colleague completely refused to do pull+rebase, arguing was not professional.
So, in my experience, you will have problems if in your team does pull+rebase and other does a simple pull :)