People leave missed calls all the time: If you're running late for a meeting and you just want to let them know that you're on the way, you leave them a missed call.
これは良く使われる手法です 待ち合わせに遅れそうになり もうすぐ来ると 伝えたいとき 電話を掛けて着信履歴だけを残します