I like the idea, and the objective it aims at fulfilling, I am not aware of the US regulations, but I think if you can hack a wristband like wearable gadget to

I like the idea, and the objective it aims at fulfilling, I am not aware of the US regulations, but I think if you can hack a wristband like wearable gadget to work with it (of-course it needs to have a vibrator in it), then you can overcome the problem of keeping the cell phone close to your body.