Modern SIM cards (e-SIMs or multi-IMSI SIMs) are capable of storing multiple IMSIs—unique identifiers for subscribers. While "IMSI 1" is often the default or primary operator identity, "IMSI 7" is frequently designated for a secondary, OTA (Over-The-Air) programmable slot. This slot is used for: Switching to a local network profile.
This process is commonly used when your phone displays "SIM Not Supported" or when cellular data is failing. 1. Identify Your Baseband Before starting, check if your phone has a How to check: Settings > General > About and look for a MEID present: load ipcc via imsi 7