Yes, as long as you're still a PC.
[M]agic is a powerful force that can be directed like a laser in the hands of an unconflicted being. [... A] mortal spellcaster has his nature as a human being, and he also has free will. These things are sometimes at odds. He has mixed emotions and doubts and so forth. [... With] his mind not entirely on the task at hand, that means there's a smidge of magic that's not being guided by his will. [... T]hat mote of uncontrolled magic ends up "leaking" out of the spellcaster, and somehow gets inside of advanced technology and screws it up.
-- "Hexing", Your Story p. 228
What "free will" means in game terms is simple - you still have Refresh. Which is a good thing, since running out of it will leave you under the GM's eventual control. Any PC spellcaster's concept aspect is pretty free game for compels as far as hexing tech goes.
Even sponsored magic or a more focused practitioner would still work this way, because even though you might be using less power or channeling someone else's power, you're still directing it with your mortal will and are liable to wonder if you left the stove on at a crucial moment.
Powers you have as a supernatural creature probably wouldn't be subject to this, since they're native to what you are, and neither would powers that flow out of an item of power, because they're native to what the item is.
However, involuntary hexing is a compel. It doesn't happen with any more frequency than "at the GM's discretion", and can be bought off if you can't even with your GPS exploding right now. Also it might not even happen with your GPS, depending?
[The Deliberate Hexing] chart assumes that the wizard is around fifty years old or younger - as a guideline, set the "1 Power" category whenever the wizard would start finding the technology truly alien.
-- "Deliberate Hexing", Your Story p.259
If, say, you're a focused practitioner and you're all about computers and the Internet, you're not going to set off your own computer or take down a network hub, at least not accidentally.
A GM-run character might or might not be subject to hexing-as-a-compel, depending on the GM's reading of their own relationship to their power and their current freeness of will.
And of course, deliberately putting out mana static in order to hex technology is something any supernatural creature can choose to do, free will or not.