With JBD advertising Offers you can see here how you restrict to see the phone number is not register at site and that you need a subscription for doing that reveal of contact data ie phone number.
check here for the <Reveal button..
I agree, would be a good idea if you have the option to set this per item. Would be even nicer if Listing owner can have also the option to set.
I also like to see a more detailed split for Contact Form. If Contact Form is included in package, the additional Contact Information is also visible. Would be nice is two separate package options.
/Robert