We have a service through which we send out our users their indian railway ticket status updates. The updates goes through SMS/Email. 90% of our users provide us their mobile number to get the status update via SMS. But we haven't figured out yet how we can monetize those SMSes. Any idea/suggestion?
You can slowly move from this to cloud telephony sector offering SMBs sms feature. Competitive price and easy user interface along with analytics on ROI should provide an edge.