noun
wrong number; misdial
Refers specifically to dialing an incorrect phone number.
さっき、かけ間違いの電話があった。
I just got a wrong-number call.
かけ間違いに気づいてすぐに切った。
I realized I had misdialed and hung up right away.
間違い電話 is a more general term for a wrong-number call, while かけ間違い emphasizes the act of misdialing.
Compound of かけ (stem of かける 'to dial') + 間違い (mistake).