While every SIM deployment is different, there are six fundamental functions of any SIM product. Matching those functions to your requirements is the first step in finding the right product for your network. In fact, if you can find a product that matches your requirements in all six areas - buy it! All that's left is to haggle over price.

This buyer's guide will step you through the six areas used to identify the key criteria you should watch for in purchasing a SIM.