Just by the same exact one, guard the receipt with your life or even better activate it when you leave the store. Put the one you can't activate in that box and return it with the receipt. They're problem now !!! Customer service is useless half the time with anything. Noone cares who they hire anymore plus work ethic and knowledge is sadly a dieing breed. I've been a long time, polite paying customer to plenty of places and maybe twice ive come across someone who actually cares about their job. Otherwise they're rude, lazy, mean or just don't know anything about their job! One of the too worked in a department though. I've found out I know more about cell phone hardware and software then whoever Walmart, Best Buy and Verizon hires.