In that case this seems to eb more advanced than actual mobiles (except maybe those with Bluetooth)
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It actually is radio - Cid specifically states during the questline leading up to the raid on Castrum Centri that they use electromagnetic waves, ala, radio. Of course this just results in the player's character looking at him blankly and forcing him to dumb down his explanation as 'lightning-aspected aetheric energy travelling through the air'. But it's clearly a radio device.
Of course mobile phone technology are also radio devices as well, but the big difference is mobile phones are 'full duplex' where both users at either end can speak at the same time, where as traditional radio communication (such as CB radio) is semi-duplex, requiring each person to take turns as transmitter and receiver. It's unclear whether linkshells are either full or semi-duplex, but either way it's clear they're wireless technology.
Good luck Moose! I only played through the Lominsa 1.0 storyline so I'm eagerly awaiting your write up of the Ul'dah and Gridania storylines. It's only extremely recently that I've finally figured out the significance of names like Niellefresne and Warburton but still have very little context for what they did.
I wonder whats the origin of those horns, especially the horn that louisoix had? We know Alagan summoners need "horns" to summon.
Maybe I should have taken that theory a little further...
http://img.finalfantasyxiv.com/t/de6...ce9ea3b9_1.png
The Final Coil of Bahamut