Public Function telc(num As String) As String

Dim tl As Integer
Dim ltem, rtem, ttem As String
Dim ti As Integer
ttem = ""
tl = Len(num)
If tl > 14 Then
num = Mid(num, 1, 14)
tl = 14
End If

If tl = 11 Then
tl = tl + 2
num = "86" & num
End If
If tl Mod 2 = 1 Then
tl = tl + 1
num = num + "F"
End If

For ti = 1 To tl Step 2
ttem = ttem & Mid(num, ti + 1, 1) & Mid(num, ti, 1)
Next ti
telc = ttem

End Function