Toll Free number effect
I went to my1voice.com (I have no affiliation with them) and got a toll free number for 10 dollars a month - first month is free (you really can't beat that)...and then added the phone number on my site. Made it really prominent - take a look at my signature.
Today I have received few calls and I have seen more sales today then any other day. Like I said, it is too early to be sure, but it could be an effect of 1-888.