Here's the kit: http://www.walmart.com/ip/T-Mobile-SIM-Kit/24099996
T-Mobile isn't exactly going out of its way to let people know this exists. It's not featured in the way you do for a plan you envision as the future cornerstone of the business.
If I were less lazy and needed more minutes, I'd setup grooveip (or something similar) with my google voice account.
I'm actually seriously thinking about switching, as my Net10 experience is sub-par compared to an actual carrier, and $30/mo is better than $45/mo no matter how you split it. 100 minutes is just too low for me, though. I love my Windows Phone, but that means no Google Voice or realistic VOIP offering.
It's really not a good plan if you use a lot of minutes, but for people like me, it's great.
Me: On a plan that says "First N GB at 4G speeds", what
speed do I get after I hit the cap?
Rep: Once the allotted high-speed data has been used
speeds will be throttled down to our 2G speeds.
This would be comparable to about twice the speed
of dial-up which translates to about 100 kbps.
Thanks for the correction!