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Not sure how you are going to charge for monitoring when any competent devops manager will know how to use Nagios.

There are plenty of paid online services for monitoring - take Pingdom for example.

and boundary.com and several others, but none that allow you to address issues from your mobile phone.

That is a feature, not a lasting competitive advantage. What if you could address issues from your phone? Whats the barrier to entry to that?