How to prevent users from brush imei

            
My software should be judged according to imei uniqueness of the phone, then give this phone payment of prizes. Users are now found to change imei, with several profitable through the brush, or other means. Some imei 111111111 so obviously false value even.
Will you have any good prevention methods.
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Hardware layer to engage in, no way to get up to the next sim card serial number, but not this stuff pad
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Users can not insert sim card ah
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Phone numbers are not on line yet
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reference to the third floor guoyoulei520 reply:

phone numbers are not on line yet

Now insert sim phone can not still play a variety of app ah
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references, 4th Floor cclovescw reply:

Quote: references to the third floor guoyoulei520 reply:

Phone numbers are not on line yet

Now insert sim phone can not still play a variety of app ah

Can play this game, did not give reward card is not on line yet
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Oh, this is a way
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IMEI do not fly, in conjunction with WIFI or Bluetooth MAC address to determine.
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Agree with # 7 floor view.
Using wifi or bluetooth determine the MAC address as the unique identifier of the device
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After these things also are not reliable, user-brush machine, these data will change, and is now estimated that there are software that can camouflage IMIE, MAC, GPS address abroad such software, the most likely or phone number, or by user name, user name, it can always be guaranteed to be unique
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Using wifi or bluetooth MAC address of judgment, as the device's unique identifier

Opposed to this approach, which also can brush
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I solved this problem, you can contact me QQ
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Unscientific, and she is still a valid mobile number should be aligned to an award.
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The above methods are not scientific, not as good as using a mobile phone number for identification
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reference to the 8th floor yiyaaixuexi reply:

agree with # 7 floor view.
Using wifi or bluetooth MAC address of judgment, as uniquely identifies a device

Help Goddess, please add attention, thank you!
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Estimates have not seen homemade cottage MAC address into chaos situation. . . Personal phone numbers agreed to serve as the basis