[android-developers] Unique ID, but not IMEI, IMSI, MAC, AndroidID

Hi,

I´m building an App and now I need an unique ID fpr every phone which
installs my App.

* I know that the IMEI can be broken and set to an android backup IMEI
(something like 0049990...).
* Read out tThe IMSI or Phonenumber is not supported by all SIM-Cards
* AndroidID can be change by the User
* MAC Adress only available if WLAN in online

Which options do I have?

Thanks a lot!

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