
There are many reasons why someone would want to keep their phone number private, such as wanting to give feedback about a product without being contacted for future sales calls. In Australia, there are several ways to withhold your number. You can apply the secrecy on a call-by-call basis or permanently. From a landline, you can dial 1831 followed by the number you wish to call. From a mobile, you can dial #31# followed by the number. You can also change your settings to make your number private by default.
| Characteristics | Values |
|---|---|
| Dial before the number | #31# |
| Dial before the number (landline) | 1831 |
| Dial to show number (silent number) | 1832 |
| Dial to show number (silent number, mobile) | *31# |
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What You'll Learn

Dial #31# before the number you wish to call
If you want to withhold your phone number in Australia, you can dial #31# before the number you wish to call. This will make your number appear as "Private" or "No Caller ID" on the receiving device. This method works for both mobile phones and landlines and applies on a call-by-call basis.
By default, mobile phones are set to show your caller ID when making calls or sending text messages. However, you can easily maintain your privacy by dialling #31# before the number. This method is simple, fast, and effective, allowing you to hide your number without having to contact your carrier or make changes to your settings.
This approach is particularly useful when you need to make a call from your personal phone for business purposes, or when selling items online, as it ensures the recipient does not have access to your personal number. Additionally, if you have moved to a new country, you may prefer to use a local number rather than your original one.
Dialing #31# is a convenient way to keep your phone number confidential on a per-call basis. It is important to note that while this method works for most carriers in Australia, it is always a good idea to verify with your specific carrier to ensure it functions as expected.
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Ask your telco for a silent number
If you want to keep your phone number private, you can ask your telco for a silent number. A silent phone number, also known as an unlisted number, will not show up on the phone you call. However, it's important to note that it may still be displayed when calling some telcos or emergency service numbers such as 000 and 112.
When you sign up with a telco, you can request a silent number. Some telcos may charge a fee for this service, so it's worth comparing different providers. With a silent number, your telco will automatically block your number from appearing on the recipient's phone. However, if you want your silent number to be displayed for a particular call, you can dial 1832 (*31# from a mobile) before the number you wish to call.
If you want to temporarily block your number for a single call, you can dial #31# before the number you are calling. This will cause "No Caller ID" or "Private" to appear on the recipient's phone instead of your number. This method works for both mobile and landline numbers across various networks in Australia, including Telstra, Vodafone, and Optus.
By utilising the methods mentioned above, you can effectively withhold your phone number in Australia, ensuring your privacy and confidentiality when making phone calls.
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Register your number on the Do Not Call Register
The Do Not Call Register (DNCR) is a secure Australian database where individuals and organisations can register, check, or remove their landline, mobile, and fax numbers to opt out of receiving unsolicited telemarketing calls and faxes. It is important to note that registered numbers can still be contacted by exempt organisations, including registered charities, research companies, registered political parties, and educational institutions.
To register your number on the Do Not Call Register, visit the official Australian government website at donotcall.gov.au. Here, you can provide your contact details and choose to register your number. It is important to note that you cannot register a number that is used or maintained primarily for business purposes, except for fax numbers. Additionally, if you have already registered your number, you do not need to re-register. You can check if your number is already registered on the website.
By registering your number on the Do Not Call Register, you can take control of the telemarketing calls and faxes you receive. However, it is important to be vigilant as the register may not stop scam calls. Legitimate callers should not mind if you want to verify their identity and the organisation they are calling from. You can do this by independently calling them back on a verified number, such as one listed on a bill or legitimate website. If you continue to receive unsolicited telemarketing calls after registering, you can report them to the Australian Communications and Media Authority (ACMA) or the Telecommunications Industry Ombudsman.
While registering your number on the Do Not Call Register is a great way to reduce unwanted telemarketing communications, it is not the only option. You can also request a silent or unlisted number from your telco, which will not show up on the phones you call except for some telcos and emergency services. Additionally, you can contact your telco to discuss other options for blocking your number on a call-by-call basis or permanently.
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Change your smartphone settings to make your number private by default
In Australia, you can choose to keep your phone number private on a call-by-call basis or permanently. Mobile phones are set to show your caller ID when you make a call or send a text message by default.
If you're using an Android smartphone, you can modify the number slightly before starting the call. Open the Phone app, then select the three dots at the top, followed by Settings. From there, tap on either Calls, Calling accounts, or Supplementary services, and under Caller ID, select Hide number or Never. Your number will be hidden for all outgoing calls. Alternatively, you can enter *67 on your keypad before typing in the area code and phone number. However, this method only works for a single outgoing call.
If you prefer to hide your number on a call-by-call basis without changing the overall settings, you can use a prefix code. Open the Phone app on your Android device, enter the prefix code (#31#), and then dial the number as usual. Your number will be hidden for that specific call.
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Dial 1831 before the number you wish to call (for landlines)
If you want to withhold your number when calling someone from a landline in Australia, simply dial 1831 before the number you wish to call. This will block your caller ID for that call. Your number will not be displayed on the recipient's phone, and will instead show up as "No Caller ID" or "Private".
This method is useful when you want to keep your phone number private. For example, you may want to give feedback about a product to a company and not want them to store your phone number for future sales calls. You may also be selling something online and not want the other person to have your number.
It is important to note that this method is for landlines only. If you are calling from a mobile phone, you can dial #31# before the number you wish to call to withhold your number. This method works for mobile numbers on the Telstra, Vodafone, and Optus (Moose) networks.
Additionally, if you have a silent phone number, your number will not show up on the phone you call, except for some telcos and emergency call services. If you wish to make your number show up when calling another number, you can dial 1832 (or *31# from a mobile) first and then the number you want to call.
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Frequently asked questions
To withhold your number on a call-by-call basis, dial #31# before dialling the number you want to call. This will make your number appear as "Private" or "No Caller ID" on the receiving device.
Contact your telecommunications provider (telco) to request a silent or unlisted number. Note that some telcos may charge an ongoing fee for this service.
A silent number, also known as an unlisted number, does not show up on the phones of those you call (except when calling some telcos or emergency service numbers).
You could consider making a privacy complaint to the Office of the Australian Information Commissioner.





































