Got this info from another forum:
It is a flexpay account type of sim. The agent/dealer will get commission from tmobile after user sign up and use service for 30 days. Therefore, they don't care if you continue to use same plan/service after that 30 days window.
I guess it is pretty much same as you go to local shop sign up from service and get a discounted phone. The agent will need you to sign a subcontract stating that you can't cancel the contract before 181st day or penalty will occur. With tmobile, I think it is 4 months, because my friend is a tmobile agent (not sure it has been changed to longer time or not) After 4 months continous services with tmobile, the agent is careless whether you cancel the service or not, because they got the commission already.
Anyway, it is still a good price for short period of time usage.
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