JCI apparently doesn't understand how to make money with a mobile data network. Conventional wisdom holds that customers should pay premium prices for redundant services. Need a data plan for a tablet? That'll be an additional 50 bucks, thank you.
So, I don't know what the folks at JCE were thinking when they announced the equivalent of a "shared minutes" scheme, with 2 SIMs using the same data plan. My goodness, they're going to ruin it for the whole industry.
A 2 GB LTE "4G" data plan is split between two separate SIM cards for ¥2,970/month, less than the cost of their 1 GB flat rate 3G SIM. Regular size and microSIMs can be mixed. Any 3G devices will work at normal speeds. These SIMs are data-only and available from either Amazon or Yodobashi.
A retail package containing two SIM cards costs ¥3,150. At the time of purchase, the SIMs are unactivated and have no charge. A credit card must be used to add a service plan for ¥2,970/month. If 2 GB is exceed in a month, additional data can be added at ¥525/100 MB. As far as I can tell, the SIMs are permanently deactivated if service is cancelled.
This would be excellent for a pair of secondary data devices, such as two tablets or handsets that don't need voice, and is perfect for a couple where one person uses much less data than the other.