It depends on your carrier. Depending on who you're with (Verizon, AT&T), the account holder can make you an Authorized User/Account Manager. It's basically like a power of attorney, you're able to make changes to the account because the account holder said its okay for you to do so.
When upgrading, please make sure to have the phone number you wish to upgrade, billing ZIP code, last 4 of the Primary Account Holder's SSN #, and account password, if applicable.
I am not a Best Buy employee and cannot issue any official responses or assist directly with any issue. Any opinions expressed in this post are those of the author and do not represent Best Buy Co., Inc., its subsidiaries, or employees. For immediate support, please call Best Buy at 1-888-237-8289 or Geek Squad at 1-800-433-5778.
