Rumors are that Apple will come out with an iPhone capable of running on T-Mobile’s 3G/4G network, and today T-Mobile took the first steps in the Apple/T-Mobile partnership. T-Mobile is now giving free Micro SIM cards to its customers.

This news comes after T-Mobile announced they have over one million unlocked iPhones on their network. It has been over a month since Apple started selling unlocked iPhone 4s in the US that work on T-Mobile’s EDGE network.

Since T-Mobile’s SIM card does work on the iPhone 4, this SIM will also work on the 3G iPad for data usage. On the T-Mobile website, the Micro SIM card is described as:

“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.”

This is good news for people like me, who have an unlocked iPhone, but had to cut the SIM down to fit in the iPhone 4. I can see T-Mobile doing this because of Apple releasing an unlocked iPhone in the US. Making it easy for unlocked iPhone users to join T-Mobile is a smart move.

Keep in mind that T-Mobile and AT&T are still set to merge as one carrier in the coming year, so this should all look different a year from now.

T-Mobile’s new Micro SIM card is available for on the carrier’s website.

What are your thoughts on this? Will you be getting a Micro SIM from T-Mobile? Leave it in the comments below.