Excel 2003. What VBA string function(s) can I use to accomplish the following:

I want to pass a string that may or may not contain a telephone number. I
want to check to see if it is indeed a telephone number. That is, I want to
check to see if the string contains only telephone type info (i.e.,
0123456789()- ) or conversely, I want to check if the string contains
non-telephone type info (i.e., alpha). How can I accomplish this? Thanks
for any help.
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Dr. Doug Pruiett
Good News Jail & Prison Ministry
www.goodnewsjail.org