I would like to switch from my monthly plan to prepaid and I'm wondering: 1. Can I do this through online self-serve (I don't see an option?) 2. If I'm on prepaid, can I keep my tab? Or do I have to pay off my remaining tab balance first? and if the latter... 3. How do I pay off my remaining tab balance through self-serve (I was told this was possible?) Thanks!! I don't see how to do either of these things, but I thought both were possible? Thanks!