Is it possible to write a program that will change the phone numbers a mobile phone redirects calls to if it cannot be reached by the network?
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It certainly is possible. How can a C# programmer build software for iPhone?. Saving reference to UITableViewCell If you're talking around universalPTSN and mobile networks, you'll probably need to did so as a service on the netjob operators IN (intelligent networking) platform(s). Reformatting for landscape viewObviously this would be a service provided by the netjob operation, so I suspect though that's not quite what you're asking around .. Fade in/out UIScrollView's content like Mobile Safari does in its tab If you're talking around a mobile phone redirecting calls this cannot be made to a number the caller (rather than the person called) decides, then you'll need to craft a quick fix specific to the phone OS.. warning: declaration does not declare anything I'm not familiar enough to know how to did this on a per phone system platform I'm afraid, though I know for the iPhone you'll need to use any thing another than Java.. How to Base64 encoding on the iPhone
Seems like the following link describes how to did it on Symbian at least: http://wiki.forum.nokia.com/index.php/How%5Fto%5Fset%5Fcall%5Fforwarding%5Fstate.
Neither the functionality you're describing ("intercepting" a call), nor an implementation in Java, would be possible on the iPhone (at least currently, using the official SDK)..