Interesting story here on The Register

"The device on show today was not just vastly bigger in terms of capacity at 512 megabytes (compared with 16 or 32 kilobytes free on a 64 kilobyte chip, for standard SIMS) but is also faster, running at 20 megabits a second, instead of the usual 9.6 to 128 kilobits per second of the normal config chip. Ultimate capacity is "whatever the technology provides", Ira Cohen, VP marketing of the company said."