So, you know what SMO means, right? No, this is not a trick question. Selective Mobile Only or SMO is a term describing the close to 30% of electronic device users who access the internet via smart hand-held (mobile) devices. The strictest definition of SMO users describes consumers who access the internet exclusively through a phone, typically for reasons of cost and for convenience. It is a reasonable assumption that SMOs are a younger demographic and tend to use multiple devices, including tablets.