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Device id - which one to choose

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Android Eclipse IDE Ubuntu
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Hi folks,

I had asked this question a few days back at android-developers site, but didn't get any detailed answers, hence the cross-posting.


Like a lot of other applications, my application has different levels of features access. Depending on the unique device ID, it switches on certain features (paid/licensing issues). This feature switching on-off is already done in existing native C/C++ code for all kind of mobile devices/PCs etc, so I wouldn't be using Androids new in-app billing (even if it provides this functionality)

I need a unique (6 byte, hex string) device id. I have looked at the following options:


Looks good, but there seem to be some issues with this.
1. This can show up null, unless the device has atleast once logged onto Android market, as per this discussion

I've read in other places too, that it might be null - due to this or other causes.

2. Certain devices have a bug where many devices show up the same (supposedly) unique id, as per this discussion

2. MAC address

This will not be available if the device is not wi-fi enabled.


Application will be potentially running on non-telephone devices like tablets too, so this is not an option.

I'm really stumped at this point. Any guidance would be much appreciated.
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