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What makes VoIP / SMS sending attractive to customers?

Recently I started a company at https://www.cheapsms.eu which provides worldwide VoIP and SMS services. The service already includes SMS API, Bulk SMS sending, VoIP calls directly from the WEB browser. What in your opinion would make it even more useful service you would like to use?
( 1 comment | 2 points | on HN )
Re:What makes VoIP / SMS sending attractive to customers? by senthadev on Sunday September 21, 2014 @02:09PM (#8347806)
How about sending binary SMS such as SIM-RFM messages?