#15 I like the separation of the acronym and full name, hinting at the curvature of the Earth. I like the use of the wireless iconography and having the slogan beneath.
#14 I like this less than #15. I was trying to think how the style of the acronym linked to my business. I thought of 'frequency' referring to radio and light transmission but it was a stretch.
I am not so sure about the blue background as I have black on my website at the moment. However, it does keep catching my eye.
To inspire you further, I deal with the whole range of IT communications networks, from global (satellites and cables) to local (4G and radios) as well as all the Infrastructure that send traffic over them (mobile devices, desktops to data centres) from Land, Sea and Air.