The power of a simple user experience across devices

I was giving some pretty important presentation today to a mobile operator on the importance of a clear and smart strategy on IMS clients and why the user experience will determine a successful rollout. It appeared to me I kept on repeating myself using the same arguments which I strongly believe in personally (ie this might not be be the same opinion as my employer):
1- The easier the client and user experience, the more the user communicates
2-The more end-points available to the user, the more he can and will communicate
3-The more rich the user experience, the more satisfied the user, the more he will communicate

In short, the more he communicates, the more bills are sent by the operator. If you think there are even more important drivers, let me know.