about free Xfinity Mobile service (SSN)

Hi! I recently signed up for Xfinity Internet and received an offer for one year of free Xfinity Mobile service.

I'm an F-1 international student in my first quarter in the U.S., and I don't have an SSN yet.

I'd like to know if I can claim this offer later once I obtain an SSN, and how long the offer will remain available on my account.

Could you please help me check the eligibility and expiration date of this specific promotion? Thank you!