irrelevant
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I'd probably use it - I get free SMS on my mobile, but cannot access the web. (Well, I can via GSM dial-up, for free, but my current phone doesn't support that, only GPRS, which my very old but cheap tariff doesn't allow me to use!)
I was actually looking into SMS facilities myself for another project, and a&a supply VoIP numbers (£1/month+vat) which will accept incoming SMS messages (on 020 3 numbers at least) delivered either by email or an http POST for free. Obviously your replies can be sent via any suitable means, so find a cheap or free web based sms...
Obviously, though, if it were to cost more than a few pennies to use, one might as well call the 08* number ....
Me, I'd charge by using reverse-charged SMS on the replies. That way you can send a free "no matches" message back, and only charge for verified results. Thus avoiding annoying people by charging them for nothing. I've no idea how much it would cost to implement reverse-charging, though, and of course you immediately fall under the remit of PhonePayPlus if you do so, and they impose BIG fines if you get things wrong!
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