IMEI number has 15 digits which will appear on the screen after dialing *#06# just like a phone number
After checking the IMEi number you will receive the following information from iPhone servers.
The data will include:
- network and country from which iPhone comes from
- purchase date of iPhone device
- system version for iPhone device
- warranty information for iPhone device
Not always all information are available, if you provide the IMEI number, you will receive all current data
For iPhone you will get info about activation lock status (Find My iPhone) and also blacklist status.