Dunno - but you can get your service provider (Voda, O2 etc) to set up a block for ALL incoming premium text services. They hate doing it (because they make money from these ludicrous charges), but just keep insisting and they are obliged to put a block on - threaten them with Ofcom if they resist.
They said they'll have to block all text, so they lied then? Surprise surprise! OH is on to Channel 5 about it as it seems to be something to do with them but I'll get him to ring EE back and tell them to stop the premium rate ones.