How can I check if the iphone/ipad UDID is real device using web-service?
To explain that, i need to send UDID to my webservice to as a user id, but I need to avoid any fake UDID.
Please tell me how can we can make that possible?
There is no way to know if any UDID is "real" or not on your server.
You want to look into secure authentication procedures where the UDID is used as a key to generate a hash that is exchanged.