No, Leo did not come up with this. It was installed by Claire Hunters, demigod representative of Camp Half-Blood. Chiron did permit it, as a slight experiment, because whilst the technology isn't monster-proof, the sheer amount of phone signals now...
Clary: okay but guys I don't think you all realise Claire is the biggest nerd on Earth 2 likes, 1 dislike
Claire:
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Claire: Wowzers, what gave it away?
Clary: well for starters, the Bazinga shirt you're wearing and the MEGALOVANIA blasting on your earphones
Claire: Oh wow, that is literally only the tip of the nerdy iceberg
Claire: if you think that's all Claire: Honey, you've got a big storm coming Claire: *strikes pose*
Jon: noice, a vine reference
BeckyD: I have seen a Dragon dictionary on her phone BeckyD: would you call that 'nerdy'?
Claire: First off, it's Dovahtinvaak. Secondly, how else am I supposed to read Word Walls?
Clary: I'm W h E e Z I n G
Jon: TBH I'm fairly nerdy too
Clary: This doesn't concern you Blue Boy
Angela: I'm confused. Is nerd an insult? It was back in my day
Claire: Angie, back in your day? You're like two or three years older than us
Angela: Well, a lot's changed, I guess??
Claire: But to answer your question, no, nerd isn't really an insult anymore. Claire: at least as far as I'm aware
Jon: Why can't people be this civil with me??? Rude
Claire: Besides, people who use nerd as an insult are actually just insulting themselves by implying that the person they're 'insulting' is more intelligent and culturally aware than them.
Claire: Jon, Angela is someone whom we regard with respect because she is a literal blessing and she and Vee are the only people on camp with more than three brain cells
Belle: Wow. Belle: Are you just gonna Lorelai: Ignore us BeckyD: Like that?
Clary: This is priceless XD
Claire: Yeah Athena kids sure you're smart but just because you think twice before wrestling with a snake doesn't mean you didn't wrestle with it
Belle: Why a snake?
Claire: Hiss hiss
BeckyD: Why is Claire acting like a snake?
Claire: aCtInG???
Claire: I will have you know that I am a pile of snakes in a skin suit
Clary: Of course, that explains the poor sense of fashion.
Claire: Hiss hiss
Leo: Hiss hiss
Jon: Hiss hiss
Clary: Oh my gods Jon they're having a moment
Leo: Moment? Hiss
Claire: Yeah what mean
Claire: Moment, hiss?
Claire: Also shush my sense of fashion is amazing what is there to hate about flannel
