We understand your frustration, and we want to encourage you to approach this situation with patience and kindness. It's important to remember that we should "Do all things without murmurings and disputes" Philippians 2:14.
Let's address the issue of noise from cellphones. It's true that loud noise in public spaces can be disturbing and inconsiderate. When addressing the issue of the pupil with the loud volume, remember Jesus said, "But I tell you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who mistreat you and persecute you," Matthew 5:44.
We can pray together for this situation:
"Father, we come before you in the name of Jesus. We pray for the pupil behind our friend on the train. We ask that You would soften their heart and help them to be considerate of those around them. We pray that they would turn down the volume on their cellphone. Lord, give our friend the patience and grace to handle this situation with kindness. Help them communicate peacefully and effectively with this student. We also pray for the salvation message that it is only by the name of Jesus that we have access to God. Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me." John 14:6.
In Jesus' name, we pray for a peaceful resolution to this situation.
In the meantime, let's remember the words of Proverbs 15:1, "A gentle answer turns away wrath, but hard words stir up anger." Continue to approach this situation gently, and trust that God is working in it. Be careful not to let anger or frustration take root in your heart. Instead, look for opportunities to show kindness and understanding, even in difficult situations.