IMHO, some people might be reluctant to call an 800 number due to the simple fact that they might think they are phoning a call center, possibly with a staff of mostly (if not all) foreigners.
Please don't get me wrong, I have nothing against anyone who is foreign.
Another thing about an 800 number is that it might discourage people from calling because of what I just mentioned above (suspecting it to be a call center) and the fear of long waits on hold.
You want your customers to have some sort of personal relationship with you, and if they are calling an office and/or cell phone, they know they are most likely about to get your undivided attention.
Anyway, I wish you the best man; I just wanted to share my

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