Those users who used the phonebook SIM card trick to activate their iPhones have started getting a “Â Different SIM Detected ” error message on emergency mode screen after jailbreaking their devices. Don’t worry because here is how to fix Different SIM Detected error shown on emergency mode.
1. Download the ifunbox software from http://www.pars-gsm.com/Downloads/ifunbox_en.zip.
2. Launch the software and sync your iPhone.
3. Now download the lockdown folder from here.
4. Navigate to /private/var/root/Library/ delete the original lockdown folder and put the earlier downloaded one in its place.
5. Restart your iPhone and the Different SIM Detected error will be fixed.