Caller find me busy in first call always
Hi, Please help. I am using Iphone 6S with IOS 11.4, last 4/5 days I am facing problem in call receiving. If some one call me first time, then the caller find me busy (but I am not busy and I receive miss call in my list)) and second time the caller can reach me. I receive miss call when the caller find me busy (first time calling),
iPhone 6s, iOS 11.4