Comment I'm in the same boat, and solved this problem (Score 5, Informative) 288
Go to the T-Mobile web-store and buy a SIM activation kit for $1. When you receive it, follow the activation instructions on the web and when it asks you to choose your plan, select "Monthly 4G $30"
* Unlimited internet*
* Unlimited Text
* 100 minutes talktime
It's basically a prepay deal where the available balance will drop by $30 a month, so you just need to top-up once a month, and make sure you have enough credit to cover any calls you make over the 100 minutes No ongoing contracts.
Deal is web-only.
*Unlimited internet means up to 5GB at HSPDA+ speeds.