iphone4 disabled

hi my son was tring to hack my pass code onto my iphone4 and got it wrong a few times and now its saying iphone disabled connect to itunes, when i connect to itunes it says can not connect my phone bacause i need to put the pass code in but it wont let me on my phone. i have logged into itunes but cannot find anywere to unlock it can u help i know my passs code pleae help asap