Tmobile upgrade question?

Mark

New member
I am currently on a family plan with three other lines. My line includes the t-mobile 5.99 tzones internet which I use on every phone I buy now. My HTC HD2 has become unresponsive and I was looking to get a new phone since other lines can be upgraded. My question is if I upgrade a line other than mine, sing up for the required data plan and cancel it the next month and use that phone on my line will T-mobile let me do this. I know "they won't" but if I don't tell them this is what I'm doing will it work?
 
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