T-Mobile has begun selling a Micro SIM card that is targeting the unlocked GSM iPhone customers.

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.

Now of course this hints at the rumors of an T-Mobile capable iPhone rumor that we heard about not so long ago. Many analysts believe that the iPhone 5 will in fact be available across all 4 major US carriers this year. Or perhaps T-Mobile really believes theres a big enough audience buying the iPhone for $650 and coming to their network.

(via T-Mobile)