On a trip I'll be making to Vietnam in the near future I will be using a local phone. I would like to withhold my number when calling people. In the UK this is done using 141 followed by the phone number, in France by #31# followed by the number.

There is no setting on my phone for this (as you would find on an iphone under Send Caller ID). What is the equivalent of this in Vietnam?

  • 1
    Cell phone or land line phone? – Tor-Einar Jarnbjo May 18 '17 at 10:17
  • 1
    Cell, my friends out there are telling me that using #31# means that the call does not connect – User632716 May 18 '17 at 11:35
  • Why do you need to do this? – JonathanReez Jun 4 '17 at 12:15

According to this help page for the CallerID Blocker app, blocking your number (i.e. your Caller ID) is not available with any network in Vietnam.

You can try a few things, but at the end of the day it may be impossible. It's not your phone that does the actual blocking, but your service provider, so ultimately anything could happen.

Dual SIM

If you want to keep people from finding out your actual number, you could consider getting a second SIM card for the times you don't want to provide your actual number. A Dual SIM cellphone would make this especially easy, allowing you to select which number to use for each call.

Phone Setting

If you really want to use just one SIM, first know that the phone setting for blocking Caller ID is not just available on iPhone. It's also on Android, Windows Phone 8, Blackberry, and presumably more. It might be worth checking your phone manual or googling something like "[Phone model] block Caller ID" if you do not have one of these phones. According to Lifehacker Australia:

On iPhones, it's found under Settings>Phone>Show My Caller ID

On Android devices it should be found by going into the menu from the phone dialler, choosing additional settings and then caller ID

On Windows Phone 8 devices, go to the dialler, choose the ellipses, then settings, then "Show My Caller ID"

On Blackberry devices, swipe down in the phone dialler and choose the cog icon. The default option is "Show my number". Tapping on that should bring up "Allow My Number to Appear" which you can then switch to off.

There is no guarantee this will setting will work, however, as your service provider is the one that actually blocks your Caller ID. The built-in phone setting is just a convenient way to communicate your intent to your provider.


If that doesn't work, my only other suggestion is to contact your phone provider in Vietnam, or try searching for a list of self-service codes for your provider and hope it includes one to block your number (like this list).

  • You could also use Skype or another VoIP service, making sure to setup that service to block outbound caller ID (the person you call may see one of Skype's phone numbers, but not yours, if you've configured the settings properly). – Zach Lipton Jun 13 '17 at 4:40
  • Good point, @ZachLipton! I originally discounted this since I don't think you can get local Vietnam numbers with Google Voice, Skype, etc., (so the locals would be able to call the OP without needing international rates), but if the OP is blocking their number then they may prefer not having a local number in the first place. – Micah Lindström Jun 13 '17 at 5:26

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