Customized Applications for Mobile network Enhanced Logic (CAMEL) is an application to easily extend the services offered within a GSM network. CAMEL provides the mechanisms to support operator specific services, which are not covered by standardized GSM services. The services can even be supported when customers are roaming outside their home network (HPMN). What this means is that the end user should be able to roam between different networks (maybe in different countries) and be reachable at the same number and should receive only one bill from the original service provider (Home Operator).