But look at how big phones still are *now*. As small as it is, you still couldn't implant a Nokia phone under your skin. Consider how big just the battery is, and they only last 24 hours before they need to be recharged again.
The folks who are paranoid about getting "chipped" so that they can be monitored at all times never seem to stop to think about how Big Brother is going to manage to recharge your "monitor" every 24 hours, or how they're going to implant into you a power supply big enough to last several years between replacements...
It just isn't practical.
Check out how "friendly" their website makes this invasive technology look:
Again, note how big the actual unit is -- it's the size of a paperback book and has to be clipped to your belt, *and* has to be recharged frequently or it's useless.
Electronics often shrink over time, but power sources aren't so easily miniaturized.