The doctor in your phone

Ali Parsa believes the mobile phone might be the most important medical piece of equipment we have and wants to use it to change the face of healthcare.

"If you have a little question you can type it in," he says showing off his app, Babylon Health.

"We'll have a doctor respond to your question in minutes."

Babylon Health is a subscription service accessed via a smart-phone app, but can it ever compete with visiting a doctor in person?