Simple iOS UDID Tracking Solution

You may want to track your application's users' UDIDs for a myriad of reasons, such as checking user retention, update rate etc. However, since Apple has changed their terms and conditions regarding UDID collection, you cannot use a third party to gain access to them, so using an SDK like Flurry won't get you what you want. So, if you want to undertake certain marketing ventures, such PPA advertising, you'll need to collect them yourself.