What is the ruling on sexual conversations between spouses via Messenger during the daytime in Ramadan, when the husband has been traveling for more than a year and a half?

There is no harm in phone calls between spouses during fasting if it is safe from anything that invalidates the fast or leads to masturbation. However, it is better to avoid that completely, and a husband should not be absent from his wife for more than six months except for an excuse.