My friend wants to commit suicide..what will I do?

Since he refuses to answer your calls, I suggest going down to his house to try to talk to him. If he let you know (well if he let anyone know) about his plans, it means that he is not sure about it. He wants someone to try to stop him. Just because he won't answer his calls doesn't mean that he doesn't want or need someone to talk to. If you do talk to him, I think you should let him know how many people care about him and perhaps even reminisce about some good times that you two have shared. Try to get him to seek help, but don't try to force it or he may feel like you are attacking him. I hope this was helpful and I hope that your friend gets the help he needs. Good luck.

This a sad situation and a heavy burden to carry for one single person. I would say continue to talk to the person to get him to change his mind. I would also contact immediate family members and make them aware of what is contemplating. Hopefully he has the family support also who can guide him, support and love him to hopefully get him to change his mind.