I booked a table with a restaurant from their website. The day before the booking, I received a text msg asking me to reply 1 to confirm the booking, which I did. Only then did I find out that I’d been charged for a premium text msg. Morally, though presumably not legally, this is theft. I would say don’t use OpenTable - but it wasn’t clear to me that I was using them, until it was too late. Avoid.