SIM Card Removal Detection via Baseline State Comparison

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Solution Overview

Problem

Existing methods fail to detect and alert users of unauthorized removal and re-insertion of a valid Subscriber Identity Module (SIM) card from and into an electronic device, which can indicate potential tampering or misuse.

Innovation Solution

A device and method that includes function blocks for detecting the initial insertion, removal, and re-insertion of a SIM card, using a user-definable electronic device with a connector and graphical user interface to report these events to the user, employing communication methods and API flags to determine SIM card presence and status.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing SIM card detection methods are used, then SIM card insertion detection is achieved, but removal and re-insertion events cannot be detected

Engineering Contradiction:

Improvedetection reliabilityVSAvoiddetection mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system performs preliminary actions by establishing a baseline state during initial SIM card insertion and storing this information. Subsequent removal and re-insertion events are detected by comparing current state against this stored baseline, enabling reliable detection without complex continuous monitoring mechanisms.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by continuously monitoring SIM card presence status and comparing it against the stored baseline state. When changes are detected (removal or re-insertion), the system provides feedback to the user through alerts, enabling reliable detection of unauthorized events.

Inventive Principle:

Principle #23Feedback

2Reliability

If continuous monitoring of SIM card status is implemented, then removal and re-insertion events can be detected, but energy consumption increases

Engineering Contradiction:

Improveevent detection reliabilityVSAvoiddevice energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system performs the monitoring action only at critical transition points (initial insertion, removal, re-insertion) rather than continuously. By establishing the baseline state during initial insertion and then checking for changes only when events occur, the system maintains detection reliability while significantly reducing energy consumption compared to continuous monitoring.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses periodic action by checking SIM card presence at specific intervals or events rather than continuously. The monitoring occurs periodically at key moments (insertion, removal, re-insertion) which maintains detection capability while minimizing energy usage during idle periods.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS8478340B1Device for and method of detecting SIM card removal and reinsertion

Publication Date: 2013.07.02 NATIONAL SECURITY AGENCY

AI summary

A device for and method of determining if a SIM card was removed and reinserted into a device by initially inserting the SIM card into the device, checking for the presence of the SIM card, if the SIM card is present then returning to the second step, if the SIM card is not present then reporting that the SIM card has been removed from the user-definable electronic device, checking for the presence of the SIM card, if the SIM card is not present then returning to the fifth step, and if the SIM card is present then reporting that the SIM card has been reinserted into the device, and returning to the second step.