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    <p><strong>EDITED</strong></p> <p>Following code for the message transfer over the bluetooth viewcontroller.h file</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import &lt;GameKit/GameKit.h&gt; @interface ViewController : UIViewController &lt;GKSessionDelegate, GKPeerPickerControllerDelegate&gt; @property (strong, nonatomic) UILabel *messageReceivedLabel; @property (strong, nonatomic) UITextField *messageToSendTextField; @property (strong, nonatomic) GKSession *session; @property (strong, nonatomic) UIButton *sendButton; @end </code></pre> <p>viewcontroller.m file</p> <pre><code>#import "ViewController.h" @interface ViewController () - (void)sendMessage:(id)sender; - (void)connectToDevice:(id)sender; @end @implementation ViewController @synthesize messageReceivedLabel = _messageReceivedLabel; @synthesize messageToSendTextField = _messageToSendTextField; @synthesize session = _session; @synthesize sendButton = _sendButton; - (void)connectToDevice:(id)sender { if (self.session == nil) { //create peer picker and show picker of connections GKPeerPickerController *peerPicker = [[GKPeerPickerController alloc] init]; peerPicker.delegate = self; peerPicker.connectionTypesMask = GKPeerPickerConnectionTypeNearby; [peerPicker show]; } } - (void)sendMessage:(id)sender { //package text field text as NSData object NSData *textData = [self.messageToSendTextField.text dataUsingEncoding:NSASCIIStringEncoding]; //send data to all connected devices [self.session sendDataToAllPeers:textData withDataMode:GKSendDataReliable error:nil]; } #pragma mark - #pragma mark - GKPeerPickerControllerDelegate - (GKSession *)peerPickerController:(GKPeerPickerController *)picker sessionForConnectionType:(GKPeerPickerConnectionType)type { //create ID for session NSString *sessionIDString = @"MTBluetoothSessionID"; //create GKSession object GKSession *session = [[GKSession alloc] initWithSessionID:sessionIDString displayName:nil sessionMode:GKSessionModePeer]; return session; } - (void)peerPickerController:(GKPeerPickerController *)picker didConnectPeer:(NSString *)peerID toSession:(GKSession *)session { //set session delegate and dismiss the picker session.delegate = self; self.session = session; picker.delegate = nil; [picker dismiss]; } #pragma mark - #pragma mark - GKSessionDelegate - (void)session:(GKSession *)session peer:(NSString *)peerID didChangeState:(GKPeerConnectionState)state { if (state == GKPeerStateConnected){ [session setDataReceiveHandler:self withContext:nil]; //set ViewController to receive data self.sendButton.enabled = YES; //enable send button when session is connected } else { self.sendButton.enabled = NO; //disable send button if session is disconnected self.session.delegate = nil; self.session = nil; //allow session to reconnect if it gets disconnected } } - (void)receiveData:(NSData *)data fromPeer:(NSString *)peer inSession:(GKSession *)session context:(void *)context { //unpackage NSData to NSString and set incoming text as label's text NSString *receivedString = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]; self.messageReceivedLabel.text = receivedString; } - (void)viewDidLoad { [super viewDidLoad]; //Button to connect to other device UIButton *connectButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; connectButton.frame = CGRectMake(20.0f, 20.0f, 80.0f, 40.0f); [connectButton setTitle:@"Connect" forState:UIControlStateNormal]; connectButton.tintColor = [UIColor darkGrayColor]; [connectButton addTarget:self action:@selector(connectToDevice:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:connectButton]; //Button to send message to other device UIButton *sendButton_ = [UIButton buttonWithType:UIButtonTypeRoundedRect]; sendButton_.frame = CGRectMake(220.0f, 20.0f, 80.0f, 40.0f); [sendButton_ setTitle:@"Send" forState:UIControlStateNormal]; sendButton_.tintColor = [UIColor darkGrayColor]; sendButton_.enabled = NO; //set button as disabled until connection is made [sendButton_ addTarget:self action:@selector(sendMessage:) forControlEvents:UIControlEventTouchUpInside]; self.sendButton = sendButton_; [self.view addSubview:self.sendButton]; //Label for message that is received self.messageReceivedLabel = nil; CGRect messageReceivedLabel_Frame = CGRectMake(20.0f, 80.0f, 280.0f, 44.0f); UILabel *messageReceivedLabel_ = [[UILabel alloc] initWithFrame:messageReceivedLabel_Frame]; messageReceivedLabel_.textAlignment = UITextAlignmentCenter; messageReceivedLabel_.font = [UIFont boldSystemFontOfSize:20.0f]; self.messageReceivedLabel = messageReceivedLabel_; [self.view addSubview:self.messageReceivedLabel]; //Text field to input message to send CGRect messageToSendTextField_Frame = CGRectMake(20.0f, 144.0f, 280.0f, 44.0f); UITextField *messageToSendTextField_ = [[UITextField alloc] initWithFrame:messageToSendTextField_Frame]; messageToSendTextField_.font = [UIFont systemFontOfSize:20.0f]; messageToSendTextField_.backgroundColor = [UIColor whiteColor]; messageToSendTextField_.clearButtonMode = UITextFieldViewModeAlways; messageToSendTextField_.placeholder = @"Enter a message to send"; messageToSendTextField_.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter; self.messageToSendTextField = messageToSendTextField_; [self.view addSubview:self.messageToSendTextField]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } @end </code></pre> <p>then include GameKit.framework and run project.</p> <p>It's work perfectly into my devices.</p> <p>Hope this code help you lot</p>
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    1. POSend string by Bluetooth IPhone SDK
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    1. COcan iPhone communicate with other devices using bluetooth..?
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    2. COYes you can try in to devices
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    3. COI doubt that... you should get it checked... because last time I checked ...iPhone bluetooth can't be used to connect with other devices (Might be possible in jailbroken devices)
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