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In my experience, they usualy respond within an hour or two, but at peak times, it can be up to 24 hours.

Check out "Firsty app". Also, the carrier called "Free" is popular.Good travels!

Trusted devices are added automatically as trusted, when you login from a new device.But you can't add them from the "Trusted Devices" page. Sending the 2FA code to email is an option, if it's any easier for you.