We do not read how things ended with Simon and what else Philip did in Samaria. Of importance is the note in Acts 9:31 about how things are with the churches: So the church throughout all Judea and Galilee and Samaria had peace and was being built up.
The believers lived in fear of the Lord and grew in number, due to the support of the Holy Spirit.
25 Now when they had testified and spoken the word of the Lord, they returned to Jerusalem, preaching the gospel to many villages of the Samaritans.