Hello.
If your new lines are on separate accounts, you would need to register them with a separate email and log in.
If your new line is on the same account as your main one, the number should be added into the app so you can switch between them as you'd expect.
I'm guessing that the numbers are not linked in the same account, if you contact the support team on our Contact Us, you can ask for your numbers to be merged into the same account.
Pete.
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