I would like to use both my landline and cell phone for 2-factor authentication? When I travel in the US I do not use my Canadian cell phone (due to roaming charges)and obviously am not able to access my home landline. Can I add a 3rd number? When confirmation is required does the message go to all phone numbers at the same time?
MacBook Pro 15", macOS 10.12
You can add multiple trusted phone numbers, including multiple landlines. Two-factor automatically communicates to all trusted devices but to use a trusted phone number to receive a code, see the following from Two-factor authentication for Apple ID - Apple Support
If you're signing in and don’t have a trusted device handy that can display verification codes, you can have a code sent to your trusted phone number via text message or an automated phone call instead. Click Didn't Get a Code on the sign in screen and choose to send a code to your trusted phone number. You can also get a code directly from Settings on a trusted device. Learn how to get a verification code.
You can add multiple trusted phone numbers, including multiple landlines. Two-factor automatically communicates to all trusted devices but to use a trusted phone number to receive a code, see the following from Two-factor authentication for Apple ID - Apple Support
If you're signing in and don’t have a trusted device handy that can display verification codes, you can have a code sent to your trusted phone number via text message or an automated phone call instead. Click Didn't Get a Code on the sign in screen and choose to send a code to your trusted phone number. You can also get a code directly from Settings on a trusted device. Learn how to get a verification code.
two-factor authentication
