Excel can dial a phone number??

Welcome to the forum.

I haven't used this in years, and don't intend to revisit it, so you're on your own:

' 1. Download MSCOMM32.OCX to WINDOWS/System32 folder
' 2. From a command line,
'   > regsvr32 c:\windows\system32\mscomm32.ocx
' 3. Add a reference to Microsoft Comm Control

Declare Function tapiRequestMakeCall _
                  Lib "tapi32.dll" _
                      (ByVal stNumber As String, ByVal stDummy1 As String, _
                       ByVal stDummy2 As String, ByVal stDummy3 As String) As Long

Sub Test()
    DialNumber ("9725551212")
End Sub

Sub DialNumber(sPhoneNumber As String)
    If MsgBox("Pick up the phone and click OK to dial " & sPhoneNumber, _
              vbInformation + vbOKCancel, "Dial Number") = vbOK Then
        If tapiRequestMakeCall(sPhoneNumber, "", "", "") < 0 Then
            MsgBox "Unable to dial", vbCritical, "Error!"
        End If
    End If
End Sub