In the wml card, add something like:
<p><a href="call.wmls#home()">Call home</a></p>
then add a wmlscript named call, something like:
extern function home()
The phone will ask for confirmation of the call, using a name out of the phone book if there is a match (but if the phone book has 01384261625 is will not see the match) otherwise the number is displayed. It is also possible to add numbers to the phones' contact list (phone book).
Finally you can also do the same things direct from XHTML pages. You may find the following document useful: http://www1.wapforum.org/tech/documents/wtai-30-apr-98.pdf