From Bethsaida, the same town as Peter and Andrew. He was directly called by Jesus. He immediately found Nathanael (Bartholomew) and brought him to Jesus. At the feeding of the 5,000 Jesus tested Philip by asking where they could buy bread. At the Last Supper he asked 'Lord, show us the Father,' prompting Jesus' teaching about being in the Father and the Father in him.
Philip, and Bartholomew; Thomas, and Matthew the publican; James the son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus;Matthew 10:3, KJV
John 1:43
The day following Jesus would go forth into Galilee, and findeth Philip, and saith unto him, Follow me.John 1:43, KJV
John 6:5
When Jesus then lifted up his eyes, and saw a great company come unto him, he saith unto Philip, Whence shall we buy bread, that these may eat?John 6:5, KJV
John 14:8
Philip saith unto him, Lord, shew us the Father, and it sufficeth us.John 14:8, KJV
Acts 1:13
And when they were come in, they went up into an upper room, where abode both Peter, and James, and John, and Andrew, Philip, and Thomas, Bartholomew, and Matthew, James the son of Alphaeus, and Simon Zelotes, and Judas the brother of James.Acts 1:13, KJV
See how Philip (apostle) connects to every other figure in Scripture.