In the US, they sell something called http://www.lifealert.com/ http://www.lifealert.com/ (very scammy late-night commercials) but I wonder why there couldn't b

In the US, they sell something called http://www.lifealert.com/ http://www.lifealert.com/ (very scammy late-night commercials) but I wonder why there couldn't be a free/cheap version of this. Kindle sells for $260 and has free life-time downloading via 3G. So it is possible to make devices that do not have monthly/annual fees that can hit a URL every now and then.