Despite an obvious affinity for mobile devices in the country, smartphone uptake in Japan has lagged compared to other parts of the world — until very recently.

The average European mobile consumer uses 1.4 SIM cards, according to a new report by Nielsen, released Wednesday. 
Mobile users who own multiple SIM cards are likely to spend more money on their mobile service, the findings also show. 
A French consumer who owns 3 SIM cards, for example, will spend 28% more, on average, than a consumer with a single SIM card.  Elsewhere in Europe, the numbers are even higher: +51% in Italy, +52% in the UK, +79% in Spain, and + 89% in Germany.
“The additional revenue brought to the operators by …