RealRider

[KeithJ]

Just read about "RealRider", Telegraph Motoring,  which offers an app for a smart phone.  From what I can tell, the key is it uses the motion detectors to sense if the rider has been in an accident, providing the smartphone is being carried at the time.  It can then alert the emergency services and pinpoint the location of the accident.
http://www.realrider.com
http://www.chroniclelive.co.uk/news/local-news/realrider-gadget-welcomed-bikers-life-saver-1352840
http://www.independent.co.uk/life-style/motoring/features/realrider-app-when-all-else-fails-for--motorcyclists-this-smartphone-app-could-be-your-last-hope-8530639.html

All for £4.99?

Looks like a snip.  Now where did I put my smartphone!

[Ethelred]

You dropped it.
It'll be easy to find though, just look for lots of blue flashing lights. 

[muskrat]

I don't know anything about smart phones, are they mobile network or satellite?
That's a really great idea, and OK if you can throw a king size dooner cover over your country. Down here about 95% of our country isn't covered by mobile phone so would need to use a satellite phone.
Don't think it would work on my phone.
Cheers