T-Mobile microSIM cards being offered by the carrier

T-Mobile begins offering its customers microSIM cards.

Quoted from T-Mobile page,

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.

More information about T-Mobile Micro SIM Card, please visit the official carrier's website.