Simon himself believed and was baptized. And he followed Philip everywhere, astonished by the great signs and miracles he saw. (NIV)
Even Simon himself believed [he adhered to, trusted in, and relied on the teaching of Philip], and after being baptized, devoted himself constantly to him. And seeing signs and miracles of great power which were being performed, he was utterly amazed. (AMP)
Then Simon himself believed also: and when he was baptized, he continued with Philip, and wondered, beholding the miracles and signs which were done. (KJV)