I usually buy a SIM card for use when travelling to non EU countries, or buy a prepaid one when I’m there, and insert my UK SIM when I get back. How will this affect the use of my Revolut app?
It should not affect services where you don’t need a code sent via text to your phone. If all cards and the account are fully verified and you have data roaming active, your experience should not be limited.
But in some cases, like installing the app on a new phone, you need access to your old phone number, or texts sent to it.
Multiple Sims while travelling