A software key control system and method for mobile devices. When a customer orders a software product, the seller issues a temporary activation key which is posted to a key registration web server. The customer then locates the mobile device's unique device ID and accesses the web server to provide the temporary activation key. The web server creates a registration key based on the customer's temporary activation key and device ID. The registration key is transferred to the customer's mobile device and the customer can then register the ordered software product. The system and method of the present invention thereby automate the sale and distribution of keys for mobile devices.