The Talk Show: Live From WWDC
7:00pm Tuesday  •  California Theatre
Tickets Available  •  Fun Will Be Had
R-UIM

Wikipedia:

Removable User Identity Module (R-UIM) is a card developed for CDMA handsets that extends the GSM SIM card to CDMA phones and networks.

So maybe this explains the SIM slot in those purported photos of the CDMA iPhone 4.

★ Thursday, 6 January 2011