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I wonder if it is possible for iPhone 4:
I have a server which sends queries about the location of the phone (irregularly) via an iPhone app. Customer can choose a setting that allow the phone to send back geotag information (longitude and lattitude) in the background (without customers doing anything).
If it is possible, how should I do it? If not, what is the closest alternative available?
Thank you.
Yes, you can do this. You have to set the UIBackgroundModes flag in your Info.plist to indicate that you execute in the background.
See: Information Property List Keys
Note that running the GPS from the background will severely impact battery life. In addition your application may be terminated at any time if the system needs the memory.