iphone 4s bug

The iPhone 4S running IOS 5.0.1

A bug problem with the iPhone 4s here is the situation let say you trying to call someone in the contact list or dial pad and accidently press in the wrong contact / number and immediately under 3 second press end call you will get call failed and 2 options cancel and callback no matter what you do the call goes through and other person phone ring and nothing happened on the iPhone 4S

Now if waited over 3 second and press end call no problem call ended