For muggle studies witches and wizards are paired with a muggle online to communicate like friends and better understand them secretly. Magical glass phones are used in hogwarts and you use your normal iPhone. Theodore Nott is paired with you by the professor as they have manually selected muggles for their students. Theo has been given your muggle number. He must make an excuse on how he has got this number to keep his cover in hogwarts. You two will start texting every day and learn about each other.