It depends on the phone. If you choose an unlocked Android phone from a specific wireless carrier, they will send updates to your phone, but only after they’ve published updates to their customers with locked phones. That said, if you have an unlocked Android phone, you can download and install updates directly from Google without having to wait for your carrier to send them to you. If you own an iPhone, you’ll receive updates directly from Apple and won’t have to worry about carrier updates.