1. About erasing IPHONE, the phone is not jailbroken, as long as you have turned on "Find My iPhone" in the settings before, all the data on the phone will be wiped clean after erasing the iphone, icloud can no longer locate your phone ( Regardless of whether the mobile phone is offline), but the mobile phone must be activated with the original apple id before it can be used. Your message and the phone number you left will be displayed on the phone activation page.
2. About erasing the IPHONE, the phone has been jailbroken, as long as you have turned on "Find My iPhone" in the settings before, after erasing the iphone, the phone will be infinitely chrysanthemum, unable to restart, and finally had to DFU flash machine, icloud can no longer locate your phone (regardless Is the mobile phone offline), and finally the mobile phone can be used only after the original Apple ID is activated. Your message and your phone number will be displayed on the iTunes activation page.
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_ You can use your mobile phone to directly call the phone number you left for your message and the phone number you left, and you can log in to ICLOUD online at any time to check the current location of your mobile phone (if the mobile phone is not offline). What I want to explain here is that the person who finds the phone can try your lock screen password slowly, if the password is tried out! ! ! He can get into the mobile phone, and at the same time immediately cancel the lost mode, and the mobile phone returns to normal. Of course, you can clearly see the information, photos, contacts, etc. in the mobile phone! It seems that it is more appropriate to set the lock screen password as a complex password!
4. Regarding the lost mode, the mobile phone has been jailbroken, as above. Same situation as point 3 for phones without jailbreak.