SimDex ehf. is a software and service company that specializes in providing electronic topup and transaction solutions to mobile operators and retailers.  SimDex Prepay is a secure end-to-end prepay system, enabling mobile operators or distributors to supply prepaid airtime, both fixed line and mobile service, electronically through various sales channels. Other electronic products or services may be distributed through the system by delivering a pin number or by activating the service through ...