We've now proven that high-capacity SIM cards are not only possible, but technically feasible. At last week's CTIA show in Las Vegas, GemPlus demonstrated its DotSIM technology, showing what can be done when you move form the 15-year-old technology to what's available today.
Until now, SIM cards maxed out at about 128 kbytes. GemPlus is showing a card at 1 Gbyte, and it's obvious that it wouldn't be that difficult to go higher.
Here's the catch: If only one handset supports the higher capacity card, users can't move the cards between handsets, which is the beauty of today's lower capacity cards. For example, when a user moves to a new handset, he simply pulls the SIM card from the old phone and inserts it into the new one.
To make this a reality, the service providers need to push the handset makers to incorporate the interface to handle the higher capacity card. Without that push, there's really not a lot of incentive for the handset makers to adopt the technology.
Service providers must push the handset makers to incorporate the interface to handle the higher capacity SIM cards.