auto dialer

[dosima]

Hi

i am using microsoft access 2007, and have created a working software from
this. The software enables users to enter customer details on the form such
as name address, date of birth etc. There is also a field for the customers
mobile number and another field for the home number.

I would like the user to click on a button (autodialer) which picks up
either the mobile number or home number and automatically dials the number.
However i have no idea how to go about doing this.
Please could someone help me and explain how i will need to set it up so by
clicking on the autodialer button will automatically make a call.
If someone could provide me with the code or a step by step guide would be
very helpful.
just to let you know the mobile number text field is called txtMobile.

Thanks in advance