Can I port a secondary number from AT&T to T-Mobile after the fact?

E

Exquisite Taste

New member
I'm switching from AT&T to T-Mobile. Purchased the T-Mobile phone online and ported the main number on the account. Can I port the secondary number after I've activated the new account or is the 2nd number going to be lost? I didn't want to start a family plan because the 2nd line won't need data or text. I just want to add a line for $9.99. The secondary line won't get much use.
 
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