I am developing a sencha based application for iPhone & Android. As a S/W requirement, i need to identify device (on the basis of IMEI or MAC address) accessing the service.
e.g. If a user of iPhone visits my sencha-web-app first time, he will need to register. And if he visits again, Application will detect and registration process will be skipped.

**Q: How can i get IMEI or MAC of device using sencha, to identify it uniquely?**