find out if you're in your friends' contacts list or not

i'm gonna tell you one small trick to find out if you're in someone's contact list or not.just go to any of your contacts and select buzz from menu.and buzz him/her.for example,h4v0ce- is in my contact list and i try to Buzz him if it says ,sorry,you are not able to Buzz h4v0ce-.it means that h4v0ce- deleted me and if i'm still in his contact list.it'll say,do you want to Buzz h4v0ce-?at start i asked those who deleted me that why they deleted me from their contacts list.they accused me of being a hacker but i told them the story.they got happy hope no one discussed it before

thanx for the useful trick bro