Every report I’ve seen comparing conversions on PCs, smartphones and tablets shows tablets as having much higher conversion rates than smartphones. Part of the reason is that people rarely complete transactions on their smartphones — they tend to buy later on PCs or tablets or offline.
That’s why it’s both interesting and curious that comScore has data showing the percentage of e-commerce transactions happening on smartphones being almost 2X of tablets. However, as a percentage of the total value of e-commerce in the US mobile (smartphones + tablets) still constitutes less than 10 percent.
The total value of US mobile commerce for the first half of 2013 is $10.6 billion estimates comScore. Of that 6 percent is coming from smartphones and 3.5 percent from tablets.