T-Mobile uncarrier credit check

So as you all know, tmobile requires a down payment to get a phone. But, the listed price is for people with good credit. I was just wondering how much you would have to pay if you had, um, bad credit lol. When there was a promotion for the nexus 4 online with $0 down, i tried to get it, but due to my poor credit, it turned out to be $180 down. That is about 45% of the phone. Is that the case for all phones? How much would I have to pay down for an htc one? Thanks.