Removing the first character of a string if it equals something

I am practicing VBA for Access 2010.

I read all the suggested post regarding my post but did not find anything specific. I know how to move specific characters in a string, what I do not know is how I can remove specific character that equals to something.

I want to move the character 1 or 1- from telephone numbers if one is there.

Example: 17188888888 to 7188888888 or 1-7188888888 to 7188888888

I am trying to use an if statement starting first with just removing the 1.

The phone number is entered as a string not numbers.

This is what I have started: I am getting an error message that RemoveFirstChar is ambiguous.

Public Function RemoveFirstChar(RemFstChar As String) As String
If Left(RemFstChar, 1) = "1" Then
  RemFstChar = Replace(RemFstChar, "1", "")
End If
RemoveFirstChar = RemFstChar
End Function