Phone locking is a desired feature for many fleets. Organizations have always struggled with the unauthorized use of company owned mobile phones. Providing mobile phones to the mobile workforce may be the necessity however, organizations have always looked for ways to limit their exposure against unauthorized usages. FRIMS phone locking application provides the functionality to limit usages. The application allows organization to white list certain phone numbers that the user can reach. Application blocks other numbers limiting the exposure. This plays a crucial role in limiting cellular costs and to enforce cellular acceptable use policy.