It will always be hard to compete with whatsapp/facebook messager and other similar services, but imo this is a great USP. In my experience people in the UK use these services WAAAAY less often than in Europe. I lived in spain for a while, and everybody and his dog had whatsapp, it was the only way to communicate.
That being said I defiantly ask my friends if they have Mime instead of whatsapp first (which they never do, but a few gave it a go).
in before you are bought out by whats app
