[monsieurbanana]

Not quite banking portals, but I've had banking apps of a South American country that were only available for Play Store accounts of that country. Really annoying, and even with VPN/proxy/Tailscale it's not easily fixable as you can only change the country of a play store account once every 12 months.

[Yeri]

Yes, many (smaller) banks only allow play/app store access to the countries they operate in (really annoying for expats!).

But that won't affect you if you're just travelling. Even if you get a new phone, your account is still set to your original country.