Why can't I get pretty little liars messages?

Okay so I have T-mobile iPhone and I'm trying to sign up for pretty little liars text messages but when I text PLL to 462223 it says that message blocking is active. I can text other people but not this number. Why? And how can I disable it

Are you sure you're supposed to be putting "PLL" as the text instead of "MORE"?

Please help! I've been trying for weeks to get texts. My phone is hooked up to AT&T and I have an iPhone 5S!

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