US12156019B2 : Seamless Network Service with Dual SIMs
Imagine you're using a smartphone with two SIM cards, and one of them (SIM 1) suddenly loses network coverage. Normally, this would mean that you can't make or receive calls, send SMS, or use mobile data on SIM 1. However, with this feature, your phone can intelligently use the network from SIM 2 to keep SIM 1 connected and working without interruptions.
How It Works:
Event Detection:
Your phone constantly monitors the status of both SIMs. It identifies specific situations (events) that might need action, such as:
- SIM 1 is out of network coverage.
- A critical data session is happening on an app associated with one of the SIMs.
- Your phone meets certain power-saving conditions that require efficient use of network resources.
Creating a Bridge:
If SIM 1 loses network connectivity, the phone uses a clever workaround. It creates an enhanced connection (called an ePDG interface) for SIM 1 by piggybacking on the mobile network of SIM 2.
Uninterrupted Service:
With this setup, SIM 1 can continue to handle calls, send SMS, or maintain active data sessions, even though its own network isn’t available. Everything runs smoothly without requiring user intervention.