Do Not Disturb blocks most calls, but not all of them

Do Not Disturb silences notifications and calls from people not on your contacts list or favorite contacts. When it is on, your phone will not ring or vibrate for incoming calls — the call goes straight to voicemail. However, repeated calls from the same person within three minutes can break through on both iPhone and Android, because the system assumes an emergency.

The exact behavior depends on which phone you have and which settings you have turned on. On iPhone, Do Not Disturb is more restrictive by default. On Android, it depends on which version you have and which manufacturer made your phone. The key difference is whether you have set up allowed contacts — people whose calls will still come through even when Do Not Disturb is active.

If you want calls to reach you at all while Do Not Disturb is on, you need to add those people to your allowed list first. Otherwise, every call will be silenced.

Key Takeaways

  • Do Not Disturb silences calls from unknown numbers and people not on your allowed contacts list, sending them to voicemail instead.
  • The same person calling twice within three minutes will break through Do Not Disturb on both iPhone and Android, even if they are not on your allowed list.
  • You can set up allowed contacts before turning on Do Not Disturb so that calls from family, work, or emergency contacts still reach you.
  • Do Not Disturb does not delete calls or messages — they arrive as voicemail and notifications once you turn it off or check your phone.

How Do Not Disturb works on iPhone

On iPhone, Do Not Disturb silences all calls, texts, and notifications except from people in your Favorites list or your designated emergency contacts. When someone calls, the call rings once on their end and then goes to voicemail on yours — they do not see a busy signal.

If the same person calls again within three minutes, the call will ring through to your phone. This is the emergency override. It assumes that a second call in quick succession means something urgent is happening.

You can customize which contacts are allowed to reach you by opening Settings, tapping Focus (or Do Not Disturb on older iPhones), and adding people to the Allowed Notifications list. You can also allow calls from Favorites only, or from specific groups like Family or Work.

How Do Not Disturb works on Android

On Android, Do Not Disturb (called Focus Mode on some Samsung phones) silences calls and notifications from most people. The behavior varies slightly depending on your phone manufacturer and Android version, but the basic principle is the same: calls from unknown numbers and non-contacts are blocked.

Like iPhone, Android allows repeated calls from the same number to break through within a short window — usually three minutes. You can add specific contacts to an allowed list so their calls always reach you, even when Do Not Disturb is on.

To set this up on most Android phones, open Settings, find Do Not Disturb or Focus Mode, and look for an option called Allowed Contacts, Priority Contacts, or Exceptions. Add the people you want to hear from, then turn the feature on.

The emergency override: repeated calls within three minutes

Both iPhone and Android have a built-in safety feature that lets someone reach you in a real emergency. If the same person calls twice within three minutes, the second call will ring through to your phone, even if Do Not Disturb is on and they are not on your allowed list.

This is not something you can turn off — it is a permanent part of how Do Not Disturb works. The system assumes that if someone is calling you twice in quick succession, they are trying to reach you about something urgent.

This feature has a downside: if someone calls you by accident and then calls back to apologize, the second call will break through. If a telemarketer calls twice, the second call will also get through. There is no way to disable this behavior.

What happens to calls when Do Not Disturb is on

Calls that do not break through the emergency override go straight to voicemail. The caller hears your voicemail greeting and can leave a message. You will see a missed call notification on your lock screen or in your Phone app, but your phone will not ring or vibrate.

Text messages are also silenced — they arrive, but you do not get a notification sound or vibration. When you turn off Do Not Disturb or unlock your phone, you will see all the messages and missed calls that came in while it was active.

Do Not Disturb does not prevent calls or messages from being received. It only prevents you from being notified about them. Everything is stored normally and will be there when you check your phone.

How to set up allowed contacts before turning on Do Not Disturb

On iPhone, open Settings and tap Focus (or Do Not Disturb on older models). Tap the focus mode you want to use, then tap Allowed Notifications From. Choose Contacts, Groups, or Favorites, then add the specific people you want to hear from. You can also add emergency contacts separately.

On Android, open Settings and search for Do Not Disturb or Focus Mode. Tap Allowed Contacts or Priority Contacts. Add the people you want to reach you — usually family, your workplace, or your doctor. Some phones let you create custom groups so you can allow calls from Work but not from other contacts.

Once you have set up your allowed list, turn on Do Not Disturb. Calls from people on that list will ring through normally. Calls from everyone else will go to voicemail, unless they call again within three minutes.

When Do Not Disturb might block important calls

The main risk is that someone trying to reach you about something real will not get through on the first call. If your doctor's office calls with test results, or your child's school calls about an injury, and they are not on your allowed list, that call goes to voicemail.

If they call back when ready, the second call will break through. But if they do not call back right away, you might not see the message for hours. This is why it is important to add people you might need to hear from — schools, workplaces, family members, your doctor — to your allowed contacts before turning on Do Not Disturb.

Some people use Do Not Disturb only at specific times, like during sleep or work meetings, rather than all day. This reduces the risk of missing something urgent while still giving you quiet time when you need it.

Frequently Asked Questions

Will the caller know that Do Not Disturb is on?

No. The caller will hear your voicemail greeting and will not know whether you declined the call, your phone is off, or Do Not Disturb is active. From their perspective, the call straightforward went to voicemail.

Can I allow calls from one person but not another?

Yes. Both iPhone and Android let you add specific contacts to your allowed list. You can also create groups — for example, allow calls from Family but not from Work, or vice versa. Check your phone's Do Not Disturb settings to see which options are available.

What if someone needs to reach me and they are not in my contacts?

Their call will go to voicemail on the first attempt. If they call again within three minutes, the second call will ring through. This is the emergency override. If they do not call back when ready, you will see the missed call and can call them back.

Does Do Not Disturb block text messages?

Yes, text messages are silenced — you will not hear a notification sound or see the message pop up on your screen. However, the message is still delivered and stored normally. You will see it when you unlock your phone or turn off Do Not Disturb.

Can I set Do Not Disturb to turn on and off automatically?

Yes. On iPhone, you can create a Focus schedule that turns on at a specific time each day. On Android, you can set a schedule in Do Not Disturb settings. Both phones also let you turn on Do Not Disturb automatically when you arrive at a location, like work or home.