Digital nomad - many SIMs

Thanks quentinb! So, for example, I was reading that the base currency is based upon the number used to sign up - in my example earlier my Polish number would make my base EUR and my Gibraltar one would make it GBP.
Are you aware of any other differences?

Regarding the address, if I give a temporary one (currently couchsurfing), will Revolut ever send me anything else other than the card to that address?