If your calls go straight to voicemail when you dial extension phone numbers, you must check if the do not disturb mode is switched on. Go into settings, and then into apps, tap on the three dots in the top right corner and then click on show system apps. Phone Call Going Directly To The Voice Mail Instead Of Ringing In Iphone - Youtube When a person is calling you and says the phone goes straight to voicemail, e number might get into the block list without your prior notice. Why do people's phones go straight to voicemail . In many cases, the problem of calls going straight to voicemail is due to iphone being placed in do not disturb mode. So, under messages & greetings, the yes button is selected for take messages, and the voicemail greeting is set to default. Try disabling your bluetooth connection and check if the problem persists. In the screening tab, user greeting is set to off. Your description suggests that you've flagged some of your contacts as spam...