Billy Graham is one of the top experts on angels,  Here is what he says about 2 questions regarding angels.

One person asked Mr. Graham if an angels was watching over them when they had a horrible wreck yet walked away without even a scratch. 

Dr. Graham asserts in his answer that this was not luck.  he claims that the Hand of God was on this because God does not want to lose this soul and that allowing this person to live is like giving them a second chance and to take it. The Bible warns, "man is destined to die once, and after that to face judgment" (Hebrews 9:27). Graham states that hell is real and no one wants or needs to go there God has given us a route to get to Heaven and that is through Jesus Christ. The Bible asks, "How shall we escape if we ignore such a great salvation?" (Hebrews 2:3). Thank God that he gave this person a second chance and wake up and take jesus as your personal saviour.

Another person asked Billy Graham if we become angels when we die.

Actually, we do not become angels because when we die we become greater than the angels. The Bible says, "It is not to angels that he has subjected the world to come" (Hebrews 2:5). It also says, "Do you not know that the saints will judge the world?" (1 Corinthians 6:2). Graham does say that he cannot be sure if people can see us after they die but that, if they can, you must be saved and in Heaven in order to experience.  It is important to take Jesus as your saviour. A simple prayer asking Jesus to enter your life is all you need and to ask him to forgive you of your sins.