Some users are getting the “Different SIM Detected” message after jailbreaking iPhone. It seems apple got the way phonebook SIM card trick used to work fixed by hooking the activation wildcard ticket to the ICCID of the used SIM. If iPhone after jailbreak and unlock go to emergency mode, just follow the steps below:

How to Resolve “Different SIM Detected” message after iPhone Jailbreak
Step 1: Download ifunbox software http://www.pars-gsm.com/Downloads/ifunbox_en.zip
Step 2: Run software and sync with your iPhone
Step 3: Navigate to /private/var/root/Library/ and delete original lockdown folder and put lockdown folder (download from here).
Step 4: Reboot your iPhone
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