Cross-Platform SIM Tracker App Development

I'm seeking an experienced developer to create and upload a highly customizable application on both Android and iOS platforms.

Key Features:
- Automatically detects and displays names and SIM card numbers of nearby devices when user is walking.
- Reads and shows names and SIM numbers of phones connected to the same Wi-Fi or Bluetooth.
- If not connected to Wi-Fi or Bluetooth, displays names of nearby devices and their SIM card numbers.

Essential Permissions:
- Full network access
- Access to Bluetooth and Wi-Fi settings
- Read SIM card information

Ideal Skills and Experience:
- Proficient in mobile app development for both Android and iOS.
- Experience with network permissions and security protocols.
- Strong UI/UX design skills for creating highly customizable interfaces.
- Knowledge of handling sensitive information securely.

Please provide past work samples and a detailed plan.