Are there ways to sync data from IPhone app to central database without the app being used?
+1
A:
If you mean sending information when the app is not running, no that's not possible.
However, the new iOS4 allows multitasking, so you're app could be sending information even when not in use.
Also, it isn't clear what "data" you refer to. If it's local application data, a simple HTTP request is all you need. A great framework is ASIHTTPRequest.
If the data isn't in your app, you only have access to the user's photos and contacts. Other information can be given with user consent.
pop850
2010-07-04 02:30:43