Specifications: Nextel boost mobile stater kits. $12 credit and SIM card included. This kit is compatable with all nextel phones. ** also have master code to change your preferences for phone, which is on back of kit. ** large quantities are available. *********** other SIM cards such as t-mobile are available aswell!! Many phones and accessories are available for t-mobile and nextel!! Feel free ask any questions. Your security aswell as mine is of the upmost importance, please let me know what I can do for you to make sure any transaction made is safe and comfortable for the both of us.