How to Block Outgoing Calls to a Specific Number on Android (2026)
NoDial Editorial ／ 2026-09-21If you want your phone to stop you from calling one particular number, you have probably already found the "Block number" button and discovered it does nothing to outgoing calls. That is not a bug. Android was built to protect you from other people's calls, not from your own. This guide lays out every method that actually exists on an Android phone, in plain terms: what each one blocks, how to set it up, and where each one falls short if your real goal is to stop calling a specific number while your phone keeps working normally.
Steps are current as of September 2026. Menu names vary by phone maker and Android version. Carrier features depend on your mobile operator.
1. The short answer
Android has no built-in setting that blocks outgoing calls to a single number. The block feature in the Phone and Contacts apps only stops calls and texts coming in from that number. To stop calls going out to a number, you have three real options:
- Fixed Dialing Numbers (FDN) — a SIM feature that only lets you call numbers on an approved list. It blocks everything else, not one number.
- Call barring — a carrier feature that blocks calls by category (all outgoing, all international, and so on). It does not work per number.
- A per-number outgoing call blocker app — the only method built to block the specific numbers you choose, while every other call goes through.
Blocking a contact stops that person from reaching you. It does not stop you from reaching them. Those are two different problems, and Android only solves the first one out of the box.
2. Why blocking a contact does not stop you calling them
When you open the Phone app, hold a number, and tap Block, Android adds that number to an incoming filter: calls and texts from it are sent to voicemail or silently rejected. Nothing about the outgoing side changes. Open the dialer, type the number or tap it in your recent calls, and the phone will place the call as usual. The same is true of "Block" in the Contacts app.
This surprises a lot of people, because the word "block" sounds symmetric. It is not. There is no toggle anywhere in stock Android that says "do not let this phone dial this number." That gap is exactly why the rest of this guide exists.
3. Method 1 — Fixed Dialing Numbers (allow-list)
Fixed Dialing Numbers, or FDN, is a feature stored on your SIM card. You build a short list of approved numbers, turn FDN on with a code called PIN2, and from then on the phone can only call numbers on that list. Everything else is refused before it dials.
FDN is genuinely strong for a child's phone or a work handset, because the person holding PIN2 controls the list and the user cannot get around it. But notice the logic: FDN is an allow-list. To block one number with it, you would have to list every other number you might ever want to call, which is not realistic for a normal phone. It also has no schedules and no limits — it is simply on or off.
The full walkthrough, including the Samsung and Pixel menus, what PIN2 and PUK2 are, and how to avoid locking your SIM, is in our dedicated guide: Fixed Dialing Numbers (FDN) on Android.
FDN is the right tool when someone else needs to control what a phone can call. It is the wrong tool for blocking one number on your own everyday phone.
4. Method 2 — Call barring (by category)
Call barring is a service that runs on your mobile operator's network, controlled from the Phone app's settings with a four-digit barring password (often 0000 by default). It can block all outgoing calls, or all international calls, or a few other broad categories — but always by category, never by individual number.
That makes barring useful if you want to stop a phone from making any calls, or from calling abroad, for example to control costs. It cannot help if you want to keep calling most people and only stop one number. There is also no way to schedule it or limit it to a few calls per week.
The exact codes, the Samsung and Pixel steps, and how outgoing barring differs from international barring are covered here: Call Barring on Android: What It Blocks, What It Doesn't.
5. Method 3 — A per-number outgoing call blocker
The one method actually designed for this problem is an app that uses Android's call-redirection role. Android lets a chosen app inspect each outgoing call the moment you place it and end the ones you asked it to end. This is the same underlying mechanism that spam-screening apps use, pointed at the outgoing side instead of the incoming side.
NoDial is built for exactly this. You add the numbers you have decided not to call. Calls to those numbers end before they connect; every other call goes through normally, and your contacts are left untouched. Because the rule lives in the app on the phone rather than on the SIM or the network, it can do things the built-in methods cannot:
- Per number. You block the specific numbers you choose, not whole categories and not everything-except-a-list.
- On a schedule. Block a number all the time, or only on certain days and hours — for example during working hours only.
- By count. Allow only a set number of calls to a number per day, week, or month.
- With a deliberate delay to unblock. Turning blocking back on is instant, but switching it off for a number takes effect one hour later. That hour is the point: it gives the moment of impulse time to pass, so a rule you set calmly is not undone in a second.
Emergency numbers can never be added to the block list, and there is no PIN or password to remember. Setup is the ordinary Android flow: you grant NoDial the call-handling role once, add a number, and it takes effect.
It is the only method whose logic is a block-list of the numbers you chose, rather than an allow-list of everything else or a category switch. That is what "block calls to a specific number" actually means.
6. Side-by-side comparison
| Block a contact | Fixed Dialing Numbers | Call barring | Per-number blocker (NoDial) | |
|---|---|---|---|---|
| Direction it affects | Incoming only | Outgoing | Outgoing | Outgoing |
| Logic | Rejects a number's calls to you | Allow-list: only these numbers | Category: all, or all international | Block-list: not these numbers |
| Block just one number? | Incoming, yes; outgoing, no | Not practically | No | Yes |
| Where the rule lives | The phone | SIM card | Operator's network | The phone |
| Code or password | None | PIN2 (from operator) | Barring password (from operator) | None |
| Schedules and limits | No | No | No | Days and hours, or calls per period |
| Undo | Instant | Instant with PIN2 | Instant with password | Takes effect one hour later |
7. Which method should you use?
- You want someone from calling you — use the built-in Block on their number. That is the incoming case, and it is what stock Android does well.
- You control someone else's phone (a child, a work device) and it should only reach a few numbers — use FDN.
- You want to stop a phone making any calls, or any international calls — use call barring.
- You want to stop yourself from calling specific numbers, on a schedule or with a limit, while the phone stays normal — use a per-number blocker such as NoDial.
Allow-list on the SIM → FDN. Whole categories on the network → call barring. The specific numbers you chose, from the phone itself → a per-number outgoing blocker.
8. FAQ
- Can I block outgoing calls to one number on Android without an app?
- Not directly. Fixed Dialing Numbers can restrict calls to an approved list, and call barring can stop whole categories, but neither blocks a single number while leaving the rest working. For that you need a per-number outgoing call blocker.
- Does blocking a contact stop me from calling them?
- No. The built-in block only affects incoming calls and texts from that number. You can still dial it. To stop the outgoing call, use an outgoing call blocker such as NoDial.
- Is there a setting on Samsung or Pixel to block outgoing calls to a specific number?
- There is no such setting in stock Android on either. Samsung and Pixel both offer Fixed Dialing Numbers and call barring in the Phone app, but both work by list or category, not by single number.
- Will an outgoing call blocker also stop incoming calls?
- Only if you want it to. NoDial is built for the outgoing side — the numbers you decided not to call. It leaves incoming calls and your contacts alone.
- Can I block a number only at night or only during work hours?
- Not with the built-in features. A per-number blocker like NoDial can block a number on set days and hours, or after a set number of calls per period.
- Can emergency numbers be blocked by accident?
- No. Emergency numbers stay callable under Fixed Dialing Numbers, and NoDial does not allow emergency numbers to be added to the block list at all.
9. Summary
Android has no built-in way to block outgoing calls to a single number. Blocking a contact only stops incoming calls; FDN is an allow-list; call barring works by category. To block the specific numbers you chose while the phone stays normal, use a per-number outgoing call blocker.
- Blocking a contact = incoming only. It never stops you from dialing out.
- FDN (SIM allow-list) and call barring (network category) both exist but cannot block one number and keep the rest working.
- A per-number outgoing blocker is the only method whose logic is "not these numbers."
- NoDial blocks the numbers you choose, on a schedule or with a limit, with a one-hour delay before unblocking takes effect. First number free.
Sources
- Google Phone Help, "Block or unblock a phone number" (blocking affects incoming calls and messages) support.google.com
- Android Developers, "CallRedirectionService" (the system role an app uses to modify or cancel outgoing calls) developer.android.com
- Wikipedia, "Fixed Dialing Number" en.wikipedia.org
- Samsung Support, "How do I use the call barring feature on my Samsung phone?" samsung.com
- AirDroid, "How to Block Outgoing Calls on Your Android Devices" airdroid.com
Operators change their defaults and phone makers rename menus. Check your operator's or phone maker's help pages if a step does not match what you see.