"I have been called." Was this over the phone? No, not exactly, but it works in the same kind of way. When someone calls you, you have to make the effort to answer the phone, and then you have the choice of when to hang up and cut off the communication. In John 15:16, Christ tells his Apostles "Ye have not chosen me, but I have chosen you, and ordained you." Christ chose his Apostles, but they still had the freedom to choose whether to accept or reject Christ. The same thing happened to me. Christ chose me to come to Western New York. And because of my love for Christ and for our Heavenly Father, and all of my brothers and sisters, I accepted the call. I am here in New York serving as a representative of Jesus Christ.
"To serve as a representative of Jesus Christ." This is a pretty east one to explain. "A new commandment I give unto you, That ye love one another; as I have loved you," (John 13:35) that is why I am doing what I am doing every day, I love everyone. I know the joy that the Gospel of Jesus Christ has given me and I want that same joy for everyone!!
"By a Prophet of God." Since God is the same yesterday, today, and forever (see Mormon 9:9 in the Book of Mormon) it would make sense that He would have a Prophet on the Earth if the fulness of His gospel was on the Earth. Well, He does have a Prophet on the Earth. He first called Joseph Smith to be His Prophet in the latter days, and He still has a Prophet on Earth. President Thomas S. Monson leads and guides the Church today under the direction of Jesus Christ. Since God will do nothing until he reveals it unto his servant the Prophet (see Amos 3:7), thus by the distributive property (meaning if A=B and B=C then A=C) when the Prophet asks us to do something, then it is Jesus Christ who is asking us.
I know that Thomas S. Monson is a Prophet of God. I know that I have been called to be here in New York by one having the authority from God. If you have any questions, please go to mormon.org and find out for yourself if these things are true!