Look no further if your business needs a reliable online charging system to implement prepaid billing services. An innovative and dependable Online Charging System (OCS) has been created by Caretel. In the telecom billing community, OCS is also known as Real Time charging system or Prepaid Billing System. Prepaid mobile plans often permit SIM card usage for both telephony and mobile data. Prepaid services require the client to pay a sum equal to the given plan in advance of using the services. The service won’t work until a prepaid payment (or top-up) has been made. To establish and provide prepaid services, the OCS system is a must.