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One of the primary reasons why IMEI check is essential is to prevent the purchase of stolen or blacklisted devices. When a phone is reported stolen or lost, its IMEI number is blacklisted by the network carriers, making it impossible to use the device with any carrier check IMEI warranty. By conducting an IMEI check before buying a used phone, users can verify if the device has been reported stolen and avoid purchasing a device that may be blocked by network carriers.