Not knowing the particular line you're trying to use, try enclosing the $PhoneNumber with \Q and \E a la: 
/^.*\Q$PhoneNumber\E$ / ...

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The \Q and \E tell the perl regex interpreter to ignore special characters that may exist in your $PhoneNumber variable (such as parens and dashes)

In reply to Re: Extracting Multiline Records from a file by Transient
in thread Extracting Multiline Records from a file by DeliriumNZ

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