Update AD-Users with new Phone-number and Pager via Powershell

Had a quick question from a customer about how one can automatically update the phone number and pager of a lot of AD users. The customer was changing switchboard and had to add 1 number in front of the current number.  Adding it in the middle of the string is also possible, but slightly more complicated as you have to split the string.

This is possible to do in a few different ways, but I chose the quickest way for me, via Powershell.

End Result:

aduser

 

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