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I'm doing an application, for the trial version I have to recognize phone from something like IMEI or MAC address, but if you are good you can spoof them, so is there something on Android that doesn't change at all? Thank you

  • there is something called UDID which is generated on boot and it only cleared when device reset to its factory defaults. So you can use it if it matches your requirement. Here is the [link](http://stackoverflow.com/questions/11292411/android-device-udid-or-unique-id) to which tells how to generate it. – himanshu1496 Jun 22 '16 at 08:24
  • maybe I could take 3 or 4 parameters so I'm sure you don't waste your time to change them all. –  Jun 22 '16 at 08:35
  • yes , the link I shared, one guy suggested to use MAC address, So probably you can combine both of them so that it will be less likely to get duplicated. – himanshu1496 Jun 22 '16 at 08:38
  • thank you, maybe also imei and serial number, because i want to put a maximum of day of trial from the server –  Jun 22 '16 at 08:46
  • yeah that will do. – himanshu1496 Jun 22 '16 at 09:22

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there is something called UDID which is generated on boot and it only cleared when device reset to its factory defaults. So you can use it if it matches your requirement. Here is the link to which tells how to generate it.

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