From iOS 7.0.2 the MAC address is: 02:00:00:00:00:00. I was saving MAC address on server, so that a user can use my app on single device with one log in and need have new log in credentials for other device. If a user deletes my app and then reinstall on same device, he could use same log in credentials. But now as MAC address is no more available and there is identifierForVendor which changes with new install, so I am unable to track it on my server.
Please help me in this regard as I can not find any way to manage tracking.