I am getting nothing but spam in my form on one of my sites; but that is nothing new as I am seeing...

Site is: www.coosbaytv.com click on SUBMIT button for the form.

Is there a simple piece of code I could slip in that would require something like a full phone number (including area code)? This would stop about 95% of all the spam because I have noticed the same number is entered which is, 123456.

If this isn't possible, I am open to like suggestions that would work. However, I am not a coder or programmer so it has to be very simple.