This is on top of the device cost and installation. The maintenance is for you to keep it loaded. Cost wise, you can use prepaid SIM or kung ayaw mong mag-abala pa sa loading, get the cheapest plan from both Telco para cguradong d maubusan ng load. In case naman na magzero balance sya, you can still use the security feature kaya lang di sya makapagrereport thru sms once there has been an illegal entry to your car. We have a brochure in case you are interested. Over-all, make sure na may load yung device for reporting purpose at pati yung cell mo to arm/disarm thru sms. There is a manual naman for you to keep and a warranty card for those interested.