When a 16-year-old boy lost his arm to a hippo in the Democratic Republic of Congo, a volunteer surgeon knew he needed to amputate the boy's shoulder – but it was beyond his area of expertise.

So the surgeon, David Nott, SMS'd a colleague in London asking him for advice, then followed the SMS's instructions to perform the life-saving surgery.
Instead of the ultra-sterile operating theatre conditions surgeons would expect to operate in, Nott has a rudimentary surgery and one pint of blood to work with.
However, he followed the step-by-step SMS's sent by his London-based colleague, and the operation was a success.
The boy is recovering.