I got signed up. I went with post-paid because I couldn't really get what I wanted with pre-paid. However of the two people I spoke to at T-Mobile neither could clearly articulate the differences. I know post-paid has what I want. It's not clear that pre-paid does.
I reiterate that I would really like to see T-Mobile align the pre and post plans with the major difference being when I pay. If you need to disable features that take on financial risk, I get that. For me, I'd like the same plan except my card gets hit at the beginning of the month. I can see that this may be more costly to manage. However, you're also getting a lot of cash an month earlier, which can only be helpful.
Lastly, I'd like whatever group is responsible for the IVR system to be forced to go through it at least once per day. They should have to navigate it like customers and experience it. It's just incredibly frustrating. "Do you want this choice with a lot of words, or this other choice with a lot of words. Please say all these words, or please say all these other words." How about "Say 'Transfer' or press 1, or say 'New' or press 2. Do you see the difference? Hard to get across in writing, but just an unpleasant experience in real time.