[gavaw]

You can change your account's country by opening the store and tapping on your avatar. It's a bit convoluted (requires you to make up an address) but it's not the end of the world.

[netfortius]

1. Only once a year - at least according to the config instructions, which I tried to avoid "testing"

2. You run the risk of losing Google voice, if the main US account is switched to another country where they do not provide voice services

[gavaw]

I was talking about Apple, sorry.