I emailed Project Endeavor asking how it worked with a iPhone, and here is the reply,
" [FONT="]The iPhone 4S is serviced by Sprint. It is a two year contract. You will pay $250 upfront. We will add $560 to that for a total credit of $810. From that $810 all charges will be deducted until the credit runs out, then you take over payments. The plan itself costs $54.99/month and is unlimited data with no voice minutes. All set up and activation fees are the same as if you would walk into a Sprint store, but we will use the credit to pay for them. The phone will be activated when you receive it. [/FONT]
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[FONT="]Let me know if there are other questions that I can answer for you.[/FONT]
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[FONT="]Lisa Karst[/FONT]
[FONT="]Project Endeavor Customer Support Specialist 1[/FONT]