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If your iPhone doesn't recognize a SIM card or can't find a signal, it may have experienced Baseband loss. Even if functions like Bluetooth and Wifi work normally, losing Baseband also means losing the iPhone's IMEI.
Fixing iPhone Baseband loss helps control the device's communication functions via electromagnetic waves, allowing the iPhone to recognize inserted SIM cards.
Guide to Fix iPhone Baseband Loss
Step 1: Check if your iPhone has experienced Baseband loss by going to Settings > General > About > Modem Firmware. There should be a 6-digit number separated by dots. If this section is missing, your iPhone's Baseband is likely lost.
Step 2: Resolve the issue by navigating to Settings > General > Reset > Reset Network Settings
Step 3: If after restarting your iPhone you still don't have a signal, swipe the screen from bottom to top and toggle the airplane mode on and off. Wait for the network to load. If you still don't have a signal, proceed to Step 4:
Step 4: Put your iPhone into DFU mode and restore it. Then, you can update to the latest firmware version for your iPhone and remember to save the SHSH of the current firmware version to avoid any firmware issues.
If you're experiencing Baseband loss, SIM card detection issues, or signal reception problems on your iPhone, follow the instructions above to resolve them. Additionally, once your iPhone is back to normal, download entertaining games such as Need for Speed and Temple Run 2.
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