[Motel75]

It should be noted that a standard SIM card already includes an adapter, namely for the original credit-card-sized SIM specification. (However, the smaller SIM size has been used from the start - for example, the Motorola International 3200 from 1993 takes it, while the Siemens S3com from 1995 uses the credit card size.) Remember that in the early days of GSM, mobile phones were extremely expensive, and phone cards with chips were a standard size, so the thought was a) a credit-card-sized SIM would be easy to transfer between units, particularly in cars and office pools and b) it was theoretically possible to adapt them for use them in a payphone as a phone card (as was possible with the pre-GSM German C-Netz SIM-like cards).

Having said that, the micro-SIM seems like a pointless idea - you've got a worldwide standard, and now they want to break this for the sake of making it only a couple of millimeters - a few percent - shorter, spurred by a device that has plenty of space for a standard SIM. It's stuff like this that made me stop being a Mac user ages ago.