Upload data through mobile network - Objective C - ios

Question

In my app, I'm trying to upload some data when the user receives some phone calls. So, is it possible to upload data through GSM data network either when a phone call comes or while the phone call is in progress? Thanks.

Answer 1

You can use the CTCallCenter class in the Core Telephony framework to register an event handler so your app gets notified when a call starts or ends and there you can do whatever you want.
The CTCall gives the following callState property
CTCallStateDialing
CTCallStateIncoming
CTCallStateConnected
CTCallStateDisconnected
Hope it helps you to solve your problem.

Answer 2

First you need to add CoreTelephony framework at your project.
Try the following code. It will give you clear understanding of the flow.
#import <CoreTelephony/CTCall.h>
#import <CoreTelephony/CTCallCenter.h>
static CTCallCenter *callCenter;
#implementation AppDelegate
- (void)dealloc
{
[_window release];
[_viewController release];
[super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[ViewController alloc] initWithNibName:#"ViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
if([[UIDevice currentDevice].systemVersion floatValue] >= 4.0)
{
callCenter = [[CTCallCenter alloc] init];
callCenter.callEventHandler=^(CTCall* call)
{
NSLog(#":: Call id:%#",call.callID);
if (call.callState==CTCallStateDialing)
{
NSLog(#":: Call state:dialing");
}
if (call.callState==CTCallStateIncoming)
{
NSLog(#":: Call state:incoming");
}
if (call.callState==CTCallStateConnected)
{
NSLog(#":: Call state:Connected");
}
if (call.callState==CTCallStateDisconnected)
{
NSLog(#":: Call state:Disconnected");
}
};
}
return YES;
}