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I'm doing the same thing but ith a used Tmobile phone (I am a curent ATT customer). Since I am a new Tmobile customer they told me I not only need a SIM card but also an activation code which the stores charge you $20 for. Walmart people are clueless so not sure what they would but may try it that way first to see if they can activate it somehow right there.
+1. This is what I did. I think I paid $13 total with tax and shipping. Alas, not keeping the service since I only get 2G speed at work and that's where I need to have 3G data. At home, I get 5Mbps on HSPA+, but my home internet is fast enough to render my wi-fi router as the bottleneck.Just order the activation kit from tmobile. Comes with sim card and activation code for $5.