What does "adding a line" mean?

What does it mean to “add a line”? Does it mean to add another phone to my account? Or does it mean to add another phone number to my phone?

I’m thinking of getting rid of my landline and would like to, if possible, have that phone number added to my phone. So is it possible to have 2 different phone numbers on one device, or would I need another phone?


Only 1 number allowed per phone. So you would need a 2nd phone.

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