Clean up Incorrectly Formatted Phone Numbers using Excel

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cleanup-phone-numbers-using-excel-howtoIn our Utopian imaginations all the data would have been standardized and shareable across systems and people. But alas, the reality is totally different. We seldom get data in the format / way we desire it to be. In other words, the ingredients are all there, but for us to prepare the dinner, you must pre-process them.

Often this pre-processing or cleaning up the data takes quite an amount of time it self leaving very little to do the actual work. That is when you can use excel’s powerful data cleaning techniques to handle the situations.

One common problem with corporate data is incorrectly formatted phone numbers. Most of us are used to a standard 10 digit phone number format like 123-123-1234 or (123) 123 1234, but when you get that customer data, very few phone numbers in it are formatted like above. Instead you might see phone numbers like 1231231234, 12312 31234, (123)123-1234 etc.

It is not really difficult to clean up the phone numbers if we know before hand how they are formatted. For eg. you can easily convert a phone number like 1231231234 to 123-123-1234 using excel text formatting functions like =TEXT(1231231234,"000-000-0000"). But it is a rare case in which we have control over the incoming format and quickly you will have to use a slew of format / text processing functions to clean up the data.

To simplify the whole thing, I have written a small VBA UDF (User Defined Function) which you can add to your excel add-ins list and use to clean up virtually any phone number format to standard phone number.

Function cleanPhoneNumber(thisNumber As String) As String
    ' this function aspires to clean any phone number format
    ' to standard format (+9999) 999-999-9999 or 999-999-9999
    ' works with almost all phone number formats stored in text

Dim retNumber As String

For i = 1 To Len(thisNumber)
    If Asc(Mid(thisNumber, i, 1)) >= Asc("0") And Asc(Mid(thisNumber, i, 1)) <= Asc("9") Then
        retNumber = retNumber + Mid(thisNumber, i, 1)
    End If
Next
If Len(retNumber) > 10 Then
    ' format for country code as well
    cleanPhoneNumber = Format(retNumber, "(+#) 000-000-0000")
Else
    cleanPhoneNumber = Format(retNumber, "000-000-0000")
End If
End Function

The above function is pretty straight forward and simple. It scans the input text for any numeric ASCII codes and saves them to another text field. Once the scanning is complete the function will format the final number to 999-999-9999 format if the number has 10 or less digits, otherwise to (+9999) 999-999-9999 format (with country code).

Like this? Learn these other data cleaning / processing tips:

Handling spelling mistakes in your data
Splitting text using excel formulas
Generating initials from names using excel
Adding a range of cells using Concat()

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17 Responses to “Custom Number Formats – Colors”

  1. Duncan says:

    You are right, Chandoo. I was playing with the colour numbers last week and some of them don't appear different from each other. Others are totally different from yours.

  2. Hui... says:

    @Duncan
    Each version of Excel, post 2003, renders colors slightly differently
    Different language versions may also have different default color palettes

  3. polo says:

    Hello in french
    excel 2010
    colo1 = couleur1 = black
    [couleur1]; [couleur2]; etc..

  4. Andras Ujszaszy says:

    @Hui, thank you very much again for this great post.
    However - under Excel 2007, Hungarian version your solution does not work with color names. I've tried both English and Hungarian names, but drops an error message "not valid formats"

    Do you have any idea how to solve this issue?
    thanks in advance

    • Hui... says:

      @Andras

      Without a Hungarian version of Excel 2003 I don't think I can assist

    • Sarah says:

      Have you tried using the colour numbers? I couldn't get the names to work (despite using an english version of excel). but it did work with the numbers though. I left out the "u" and was easily able to produce burgundy using [color9]

    • Florinel says:

      Here a possible solution: find an English version of Excel, write there the formats using English names, then open the file in the Hungarian version and see the translation.

  5. Nigel says:

    In Excel 2007 I can't get the colour names to work e.g Sea Green but the numbers do e.g color3 - colour3 does not work so I must bow to the country that has stolen my language (ha ha!)

  6. Hey chandoo, nice Tip!
    Wouldn't be easier just apply some conditional formatting for negative numbers and another for positive numbers? Or there's some cases that you can't do that?

  7. Unfortunately the TEXT function doesn't color the cell as number formatting does.

  8. Khalid NGO says:

    Hi Hui,
    Great post Sir, love the new way of formatting with color numbers.
    I am using 2007, and it leads me to the last color number 56.

    Thanks Hui.

  9. […] explains how to set up custom number formats with a wide array of […]

  10. Colin says:

    Thanks Hui - works a treat!

  11. John Smith says:

    Thank you, very helpful.
    Trying to figure out if it is possible to apply color only to a part of the cell?

    E.g. I have a value formatted as Accounting with a currency symbol.
    Those I find somewhat distracting though necessary. If I could make them less obtrusive by coloring them gray while the number would stay black, that would be great. Tried tinkering with the format string, but didn't get the desired result. Single color for complete cell value works, but coloring just part of it could not be achieved. Maybe somebody managed that?

  12. Shaun says:

    Exactly what I was looking for - thank you!

  13. colour in the Australian doesn't work - we have to go American and no problem.
    I always thought is was 56 colours notice you have 57. Cool.

    thanks
    Analir Pisani
    Customised Microsoft Office Training Specialist
    Sydney - Australia
    http://www.azsolutions.com.au

  14. Me Myself says:

    Thank You!

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