Advice - I currently have unlimited (grandfathered) with ATT. In the past 2 years - I have only gone over 3GB twice (and not by much). I have loads of Amazon credit and am going to upgrade my phone. However - if I go via Amazon, I will lose unlimited. To keep or not to keep unlimited is the question. I think I am leaning towards keeping because you never know in the future what services will use more data. But on the flip side - unlimited might not be grandfathered forever, it does save me $250 out of pocket to use Amazon and I'm on WiFi a lot. Torn Thoughts?