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You can add the same phone number to multiple accounts and use Steam Guard Mobile Authenticator for multiple accounts. The only-one-account-per-phone number rule was changed.
https://support.steampowered.com/kb_article.php?ref=8625-WRAH-9030&l#morethanone
So now you may use your phone for both of your acounts.
However, when trading, I need to log into the right account so I can access its confirmation tab. Not sure why I can't just remain logged in to both accounts at the same time, but I guess Valve doesn't want to make it too easy to bypass their system.
All you need to do is to log into the Steam app on every account, link it to the same mobile number and verify it. After which you have the Steam guard mobile code for all the accounts you linked. Just swipe the box where the code is, and you can see the Steam guard codes for all the accounts you linked with the same mobile number/Steam app.
Hope that helps.