Philip was originally a disciple of John but became a follower of Jesus as related at the beginning of John's gospel. James was the son of Alphaeus and a cousin of the Lord.
In the early church, James was the leader at Jerusalem and converted many Jews to the faith. At the council of Jerusalem in AD 49, James was the main person who settled the argument about gentiles coming into the Christian faith. Some said they had to become Jews fist but James said that this was not the case.
James was martyred in AD62 by being thrown off the roof of the Temple. He was the first apostle to die. There is something very symbolic about the death of James, how the new faith and all to do with it was being thrown out of the Temple. This was a real premonition of things to come.