Mobile Device MDIN Verification for Unauthorized SIM Access
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Solution Overview
Problem
Mobile devices can be easily misused by unauthorized users after theft or loss, as they can simply replace the SIM or removable provisioning data memory unit with their own, rendering existing methods to deactivate cellular services insufficient in preventing unauthorized access.
Innovation Solution
A personal mobile device identifier number (MDIN) is created and stored in secure memory, requiring users to enter it before accessing a new SIM or removable memory unit, with incorrect entries potentially locking the device, thus preventing unauthorized use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a user deactivates their account with their cellular service provider, then unauthorized use of cellular service is prevented, but unauthorized users can simply replace the SIM card with one of their own to freely use the stolen or lost mobile device
Solution Approach 1:
The system performs preliminary actions by binding the SIM card identifier to the device before any unauthorized use occurs. When a SIM card is inserted, the system checks if its identifier matches the bound identifier stored in the device. This preliminary binding and verification mechanism prevents unauthorized SIM cards from being used, resolving the contradiction between account deactivation protection and SIM card exchangeability.
2Adaptability or versatility
If the mobile device allows free SIM card replacement, then device adaptability is improved, but the device becomes vulnerable to theft and unauthorized use
Solution Approach 1:
The system introduces an intermediary verification mechanism between the SIM card and the device functionality. The SIM card identifier binding acts as an intermediary check that must be satisfied before the device allows access to its functions. This intermediary mechanism enables legitimate SIM card replacements while blocking unauthorized use, resolving the contradiction between device adaptability and security against theft.
3Reliability
If the mobile device requires MDIN verification for SIM card changes, then unauthorized use is prevented, but user operation complexity increases
Solution Approach 1:
The system implements self-service by automatically performing the SIM card verification and binding process without requiring manual user intervention. When a SIM card is inserted, the device automatically checks if it is authorized through the identifier binding mechanism. This automated self-service approach maintains high reliability in preventing unauthorized use while minimizing the operational burden on users.
Data Source
AI summary
Methods and devices for preventing unauthorized use of mobile devices allow users to create a mobile device identification number (MDIN) which must be entered before mobile devices can access a new removable memory unit. Upon activation a mobile device may check an identifier of an installed removable memory unit to determine if the memory unit has been changed. If the mobile device determines that the memory unit is new, it may prompt the user to enter the MDIN. If the entry made by the user matches the MDIN stored in secure memory, the mobile device will access the new memory unit and function normally. However, if the entry does not match the MDIN stored in memory the mobile device may not access the new memory unit, thereby denying use of the mobile device. Example removable memory units include Subscriber Identity Modules, Universal Integrated Circuit Cards, and Removable User Identity Modules.