T-Mobile begins offering iPhone-friendly micro-SIM cards

For the first time ever in the U.S., T-Mobile is now offering an official micro-SIM card. That’s the precise type of SIM you’d need if you wanted to use, say, an unlocked iPhone 4 on T-Mobile’s network. Previously, using an unlocked iPhone 4 with T-Mobile required that you break out some sharp tools—or at least …