Not much to say other than this is complete Net10 SIM card kit. Includes most common SIM card types you may need to activate a smart phone on Net10 network through the carrier of your choice: ATT, T-Mobile, Verizon (Sprint available, but have to call customer service for activation - no SIM included for Sprint). Activation on GSM carriers (ATT, T-Mobile) is fast & easy. CDMA carriers (VZW, Sprint) is not as quick, but activation on VZW was still easy & relatively simple. Have not tried it with Sprint, as Sprint seems disinclined to support 3rd party carriers (Net10). I needed a phone on VZW to use on a remote jobsite as the GSM carriers had very poor cell coverage. This SIM kit is necessary to start your service on Net10 wireless. Straightforward, painless, relatively quick (this is my 2nd phone on Net10). Much easier than dealing with the big 4 carriers directly, no contracts, better pricing, yet still able to select the major carrier of your choice for best coverage.