I only have one line on my account, can I still use BestBuy to upgrade and keep Unlimited Data Plan?

[yourphonemyphone]

I only have one line on my account, can I still use BestBuy to upgrade and keep Unlimited Data Plan?

My current phone is a very old Samsung Galaxy S III. I"m interested in getting a HTC One M8.

 

[Droid3r]

Yes... Study the best buy method. And execute

 

[dpham00]

^look in the sticky

Sent from my Verizon Samsung Galaxy Note 4