Misdialed call

wrong numbermisdialmisdialled callsmisdial callsmisdialing a phone callmisdialledmisdials
A misdialed call or wrong number is a telephone call to an incorrect telephone number.wikipedia
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Area codes 919 and 984

919984919, 984
In Raleigh, North Carolina, a 2012 change which forced subscribers to dial the 919 area code on local calls caused a 20% increase in total calls to 9-1-1, a result of frequent misdials.
Ten-digit dialing for local calls became optional on October 1, 2011, and became mandatory across the Triangle on March 31, 2012, a move which has resulted in thousands of wrong number calls to 9-1-1 instead of 919.

555 (telephone number)

555555 telephone number5-5-5
This is often avoided by using reserved or invalid numbers (such as 555 (telephone number)), or by displaying a real area code and number which belongs to the publisher of the fictional work.
Tommy Tutone's song "867-5309/Jenny" and the cinematic release of Bruce Almighty displaying 776-2323 as a number to call God both led to misdialed calls in multiple area codes.

867-5309/Jenny

867-5309867-5309 (Jenny)867-5309 and asking for Jenny
Well-known fictional numbers like 867-5309 (Jenny's number, from a popular 1982 song) and 776-2323 (God's number in the 2003 cinema release of Bruce Almighty) continue to receive misdialled calls years later.
In 2013, the number was still ringing up fifty misdialled calls daily for Florida realtor Carrie Routt in area code 850.

Phoneword

mnemoniclettersphone word
By tying up millions of easily remembered numbers, these schemes force businesses to use overlay plan area codes or numbers without mnemonic phonewords.
The dialing of 1 or 0 instead of I or O in phonewords can lead to misdialed calls; one such typosquatting incident targeted 1-800-HOLIDAY (+1-800-465-4329, the toll-free direct reservations line for Holiday Inn) by subscribing 1-800-H0LIDAY (+1-800-405-4329, the same number with 'o' replaced by 'zero') to a rival vendor which stood to collect a profitable travel agent's commission.

Typosquatting

catchall" typosquattinggoggle.comMisspelled
In some cases, commercial rivals have engaged in wilful typosquatting to profit from misdial traffic.
Misdialed call#Toll-free numbers (for similar attacks on vanity toll-free telephone number phonewords)

Telephone call

callphone callphone calls
A misdialed call or wrong number is a telephone call to an incorrect telephone number.

Telephone number

phone numbertelephone numbersphone numbers
A misdialed call or wrong number is a telephone call to an incorrect telephone number.

Telephone numbering plan

Area codeCalling codearea codes
This may occur because the number has been physically misdialled, the number is simply incorrect, or because the area code or ownership of the number has changed.

North American Numbering Plan

Area codeArea codesArea code(s)
In North America, toll-free numbers are a frequent source of wrong numbers because they often have a history of prior ownership.

United Kingdom

British🇬🇧UK
In the United Kingdom, many misdialled calls have been due to public confusion over the dialling codes for some areas.

UK telephone code misconceptions

common misconceptionerroneous UK telephone codesmisquoted
In the United Kingdom, many misdialled calls have been due to public confusion over the dialling codes for some areas.

Called party

calleebe calledcall receiver
The recipient of a wrong number is usually unknown to the caller.

Calling party

callercall originatorcall
The recipient of a wrong number is usually unknown to the caller.

Social science

social sciencessocial scientistsocial
This aspect has been used in social science experiments designed to study the willingness of people to help strangers, and the extent to which this is affected by characteristics such as race.

Race (human categorization)

raceracialraces
This aspect has been used in social science experiments designed to study the willingness of people to help strangers, and the extent to which this is affected by characteristics such as race.

Etiquette

mannersprotocolpropriety
Proper telephone etiquette recommends that the wrongly dialled party politely inform the caller of that fact, and also that the caller apologize rather than simply hanging up.

Politeness

politeimpolitepolitely
Proper telephone etiquette recommends that the wrongly dialled party politely inform the caller of that fact, and also that the caller apologize rather than simply hanging up.

Regret

apologyapologizeApologizing
Proper telephone etiquette recommends that the wrongly dialled party politely inform the caller of that fact, and also that the caller apologize rather than simply hanging up.

On- and Off-hook

off-hookon-hookon hook
Proper telephone etiquette recommends that the wrongly dialled party politely inform the caller of that fact, and also that the caller apologize rather than simply hanging up.

Landline

fixed linefixed-lineland line
On a landline, wrong numbers incur no toll for the recipient but do represent the annoyance of answering an unwanted call.

Shift work

shiftgraveyard shiftnight shift
This may be problematic for shift workers who are asleep during the day.

Mobile phone

cell phonemobilemobile phones
On cellphones in countries where mobile plans charge for incoming calls, a wrong number may cost the subscriber one or more minutes.

Typographical error

typotyposscribal error
Sources of misdialled calls are similar to sources of typographical error:

Dialling (telephony)

dialingDiallingdialpad
Pressing a key on the dialpad more times than appears in succession in the phone number, thereby completing the length of the number prior to completing the intended number (example 7522-7 with the final 7 being ignored rather than 7527)

Bruce Almighty

Almighty
Well-known fictional numbers like 867-5309 (Jenny's number, from a popular 1982 song) and 776-2323 (God's number in the 2003 cinema release of Bruce Almighty) continue to receive misdialled calls years later.