Nice. It's difficult to play with idioms/cliches/etc in a haiku or senryu. The impulse is to turn them upside down. But you've taken it at face value, literally, and thrown in in the face of the reader. The bigger picture for me is how you've captured the notion that our idea of freedom is being slave to our devices.
Fresh and funny, while at the same time a sad/ironic commentary on the way we isolate ourselves–even in public places. To me, this poem is an excellent example of why we should not seek to entirely eliminate the colloquial or cliche from our short form poetry. Gotta wonder how many folks read this one on their devices using free WiFi…; )
A very neat senryu, and we can unearth more from it on subsequent readings. As wifi is technically 'free' in coffee shops, I wonder what would happen if it had to be paid for, as it's often the case in hotel rooms.
So many types of devices now can access the internet. I am slightly amused that the once humble telephone, once a thing for parents in the hallway, but never to be touched by children, is more a thing for children nowadays.
I do have a smartphone, which is useful when I get so many spam cold callers.
One of those deftly written verses that you wrote as:
"At the time, It just seemed the best way to say it."
And as Autumn mentions, today I'm viewing and composing via free wifi at a Best Western coffee lounge. :-)