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Resume application after call through application

Resume application after call through application:

//Call from any button Click
-(void)call{

       [self callWithOutExitApplication:[NSString stringWithFormat:@"+%@",@"123456789"]]

}


-(void)callWithOutExitApplication:(NSString *)pPhoneNumber{
   
    NSURL* callURL = [NSURL URLWithString:[NSString stringWithFormat:@"tel://%@",pPhoneNumber]];
    
    
    
    // Make sure device supports phone functionality.
    
    if([[UIApplication sharedApplication] canOpenURL:callURL]){
        
        if(callURL){
            
            
            
            NSString *osVersion = [[UIDevice currentDevice] systemVersion];
            
            
            
            if ([osVersion floatValue] >= TEL_OS_VERSION) {
                
                // To resume the application after call is disconnected, initiate the call using the webview (Work around). In this case a confirmation alert will be shown to user.
                
                UIWebView *webview = [[UIWebView alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];
                
                [webview loadRequest:[NSURLRequest requestWithURL:callURL]];
                
                webview.hidden = YES;
                
                // Assume we are in a view controller and have access to self.view
                
                [self.view addSubview:webview];
                
            } else {
                
                // On 3.0 and below, dial as usual
                
                [[UIApplication sharedApplication] openURL: callURL];
                
            }
            
        }
        
    }
    
    else{
        
        // If device dose not support the calling feature then show an alert.
        
        UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Error", @"Error")
                                  
                                                            message:NSLocalizedString(@"NotSupportedFeature", @"Device does not support this feature.")
                                  
                                                           delegate:nil
                                  
                                                  cancelButtonTitle:@"OK" otherButtonTitles:nil];
        
        [alertView show];
        
    }
}

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