Best Buy lists this number on its website as its corporate office. It's answered by an automated voice that recommends visiting the company's website for assistance. It then provides a website for vendors that want to become partners and another company to contact for vendors needing assistance with account details. It tells you to stay on the line for help with anything else. At this point, I believe it transfers you to Best Buy's main support line (888-BESTBUY). I've called that number before and it sounds like the same menu system. If you press any keys earlier in the call, it transfers you immediately.
Most of the menu is voice-activated. It first asks for the phone number on your My Best Buy account or for you to say "I don't have one." Either way, it responds by thanking you and asking what you need help with. If you don't reply, it repeats the message along with a few examples. If there's still no response, it encourages you to answer so it can transfer you to the right department, followed by key-press options. The system includes help with recent purchases, tech support, appliance support or installations, Geek Squad billing help, My Best Buy points, and selecting a product or making a purchase.
Selecting tech support or Geek Squad billing will require you to further narrow down your question, and then the system sends you to a Geek Squad customer service representative. The rest of the options take you to a general rep. I'm not sure if these all go to the same call center or if they're further separated into departments. The My Best Buy points option encourages you to log in to your account online, but it still takes you to a rep.
I had questions about some of the company's products, so I chose the last option. A rep answered right away, but the quality of the call was awful. It sounded like being on speaker in a crowded room, and I could just barely hear the rep saying hello. I hung up and called back. Going through the whole menu again was tedious, but I have a habit of waiting for button-press options instead of speaking.
My second call was also answered immediately. The rep asked for my full name and phone number. I'm not sure why you're asked to provide your number at the beginning of the call; it didn't seem like the rep had the information I entered. She was professional and able to answer all my questions. I was encouraged to complete my purchase online. It wasn't clear if I could make a purchase over the phone, but I didn't ask about it.
If you can't get help over the phone, try visiting Best Buy's support web page. It offers live online chat. This is the most prominent contact option on the site, and you have to dig a little more to find the company's main phone number. The support page has articles covering several topics.