Php 3:20 For our conversation is in heaven; from whence also we look for the Saviour, the Lord Jesus Christ:
Php 3:21 Who shall change our vile body, that it may be fashioned like unto his glorious body, according to the working whereby he is able even to subdue all things unto himself.
Now that he's warned against being worldly, he goes back to his main point of striving toward God and following the examples of more mature Christians. Conversation here, again, can mean just general behavior and standing in the community. Our behavior should be in heaven and not of this world, because we're looking toward the next life with our King and Savior, Jesus. We're to be distracted by Him to the point we don't get distracted by the evils of the world! He is able to change our sinful desires of the flesh and make us part of Him.
Rom 12:2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.