Originally Posted by Running Water:
“It's free on a tariff with unlimited texts to any network. The OP is on O2 Unlimited which only offers free texts to other O2 numbers.
Even if there was an 07xxx number for Facebook, it would have to be an O2 number for the OP to be able to send a text to it free.
The alternative is to change tariffs to Text & Web. Text 'TEXTANDWEB' to 21300.”
I'm not sure that is the case, according to O2 they should be coming out of the allowance on O2 Unlimited. Confirmed this with a friend's lad who is on O2 Unlimited, he's not getting charged.
Perhaps there is a deeper mystery here!
(I'm also puzzled by the 12p thing, isn't the SMS charge on that tariff 10p?)