Cellphones are getting smaller all the time – so much so that the size of the user’s SIM card, which contains ID and phone number data, is now a limiting factor. But Japan-based phone firm DoCoMo has found a way to miniaturise new SIM cards so that they are still compatible with today’s standard-sized phones (WO 03/100720).
The card is the usual size, with the standard eight memory chip contacts in the usual place. But it also has eight much smaller contacts tucked away in a corner. The two sets of contacts are connected by copper tracks and there are…
