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IMEI uses all phone brands that support GSM signals. IMEI is used to indicate your device in operator networks. If you lose your device or someone stole it, by imei you can report to police and to your network so they can add your imei to a blacklist base. Also via IMEI you can apple check warranty on our website, or iCloud status check and iphone imei number check .

If you pay only 5-10 minutes ago, then yes, you can send to us request for cancelation, BUT if you ordered any of our check services (such as the Carrier and SIMLock Check, Find my Mac CHECK, Sold By Check and others) then there is no Cancelation, because this is INSTANT services.

No, sim unlock does not affect your phone data. But if you will need to restore device to the factory settings, you need to make a backup of your device.
NOTE! If you do not know your apple id or password, then you can't pass the activation screen!

You can find the model number in settings->general->about - Model number.