Can you change phone numbers from old telephones to new smart phones with a special computer in best buy?

This is something that you would be able to do at BestBuy. You won't be able to do it on your own, you will need to work with a Blue Shirt employee and the information of the account(s) the phone numbers you want to swap or upgrade are attached to.

You dont need best you for that, you can do it at your phone company shop or with a Google account on back up settings option

If you want a secury information go to best buy