[eru]

Number transfers in other countries is also mostly just a question of a bit of social engineering.

[throwaway2990]

No. Most require some form of identification or matching identification between mobile providers.

[macrolime]

I recently had an issue with a sim card and went to phone store that gave me a new one and disabled the old. They're supposed to ask for ID, but often doesn't bother. This is true for pretty much every country. Phone 2FA is simply completely insecure.

[eru]

If the ID matching is done by humans, you can use social engineering on it.

See the sibling comment.