Editing Caller ID (section)

===Disabling caller ID delivery===
Depending on the operator and country, there are a number of prefix codes that can block or disable Caller ID transmission by the caller. Prefixing a telephone number with the following codes disables Caller ID on a per-call basis:

{| class="wikitable"
|-
!Country !! Prefix
|-
|Albania || #31# (cell phones)
|-
|Argentina || *31# (landlines) or #31# (most cell phone companies)
|-
|Australia || #31# (mobile phones)<ref>{{cite web |url=http://exchange.telstra.com.au/2012/06/19/how-to-block-your-number-when-calling-someone/ |title=HOW TO: block your number when calling someone |date=19 June 2012 |access-date=February 19, 2019 |first=Leigh |last=Price |website=Telstra Corporate Affairs |archive-date=4 March 2017 |archive-url=https://web.archive.org/web/20170304074547/https://exchange.telstra.com.au/2012/06/19/how-to-block-your-number-when-calling-someone/ |url-status=dead }}</ref> 1831 (analogue landline) *67 (NBN landline)
|-
|Brazil || #31# (mobile phones)
|-
|Bulgaria || #31# (mobile phones)
|-
|Canada || #31# (mobile phones) or *67 (landlines)
|-
|Croatia || #31#
|-
|Denmark || #31#
|-
|France || #31# (cell phones) or 3651 (landlines)
|-
|Germany || On most landlines and mobiles, *31#; however, some mobile providers use #31#.
|-
|Greece || *31* (landlines),  #31# (cell phones).
|-
|Hong Kong || 133
|-
|Iceland || *31*
|-
|India || #31# after network unlocked
|-
|Ireland || #31# (dialling from mobile) 141 (dialling from landlines)
|-
|Israel || *43  (landlines) or #31# (most cell phone companies)
|-
|Italy || *67# (landlines) or #31# (most cell phone companies)
|-
|Japan || 184
|-
|Nepal || *9# (NTC)
|-
|Netherlands || *31*, #31# (KPN)
|-
|New Zealand || 0197 (Telecom/Spark), *67 (Vodafone), #31# (2degrees)
|-
|North America || *67, 1167 (rotary phone), #31# (AT&T Wireless)
|-
|Pakistan || *32# PTCL
|-
|Poland || #31# (mobile phones)
|-
|Romania || #31#
|-
|Serbia || *31* (landlines),  #31# (cell phones).
|-
|South Africa || *31* (Telkom)
|-
|South Africa || #31# (Cell Phones)
|-
|South Korea || *23 or *23# (most cell phone companies)
|-
|Spain || #31# (Cell Phones); 067 (landlines)
|-
|Sweden || #31#
|-
|Switzerland || *31# (or *31+Targetnumber -> Call-by-Call disable) (landline)<br/>#31# (or #31+Targetnumber -> Call-by-Call disable) (mobile)
|-
|United Kingdom || 141
|-
|United States || *67
|}

Other countries and networks vary; however, on [[GSM]] mobile networks, callers may dial #31#<ref name="gsmfeatures">{{cite web|url=http://www.arcx.com/sites/GsmFeatures.htm|title=PCS Sites Redirect|website=www.arcx.com|access-date=2008-02-12|archive-url=https://web.archive.org/web/20080203034744/http://www.arcx.com/sites/GsmFeatures.htm|archive-date=2008-02-03|url-status=dead}}</ref> before the number they wish to call to disable it.

Some countries and network providers do not allow Caller ID blocking based on the domestic telecommunications regulations, or CLIR is only available as an external app or value-added service.<ref>{{cite web |url=https://www.lifewire.com/top-call-blocking-app-for-smartphones-4050085 |title=The Best Call Blocker Apps For Smartphones |first=Nadeem |last=Unuth |website=Lifewire |date=December 20, 2018 |access-date=February 18, 2019 |archive-date=February 28, 2019 |archive-url=https://web.archive.org/web/20190228192145/https://www.lifewire.com/top-call-blocking-app-for-smartphones-4050085 |url-status=live }}</ref>