Is it religiously permissible for a girl to remain in phone contact with a young man who proposed to her and promised to marry her, but circumstances have delayed this marriage, especially given that she has never met him before and he is two years younger than her?

A woman's conversation with a man, whether by phone or other means, is forbidden if it leads to fitnah (temptation/discord), such as talking about emotional matters. This is considered a prelude to immorality and a step of Satan. These men are often deceivers who seek vice and may exploit women for blackmail. A woman must be extremely cautious and preserve her honor, modesty, and chastity. These phone relationships are considered steps of Satan that lead to immorality and evil, and may result in the exploitation of women. The path to marriage is known and clear, and one should not rely on promises from unknown individuals. These relationships must be cut off, regretted, and forgiveness sought from Allah, and one should busy oneself with what is beneficial in matters of religion and worldly life. A righteous husband is a provision from Allah for a righteous woman.