T-Mobile USA begins the sale of Micro SIM cards

T-Mobile USA has started selling for the first time Micro SIM cards via its website. The cards, which are basically just smaller SIM cards, are currently used by popular smart phones, including Apple's iPhone 4.

Already have a GSM phone or iPhone that you need to activate—or have an unlocked GSM phone you want to use on the T-Mobile network? Just get a Micro SIM card and choose a plan. Slip the ready-to-use Micro SIM Card into your phone and you're ready to go.

The Micro SIM cards are available free of charge for customers and available online only at this time. The iPhone 4, which is one of a few phones that use the Micro SIM cards is the main draw for T-Mobile, which has yet to offer the handset. iPhone owners who unlock, or buy factory unlocked, phones can use these new cards in their phones for service. One downside for iPhone owners who want T-Mobile service is that their 3G network uses a different band than AT&T, therefore 3G is not available and users must use their slower EDGE network.