I was just flagged today, as well. My billing cycle ends tomorrow, so I'm "prorated' for today it looks like. I also got placed on the 3GB/mo plan.
I've had my Galaxy Nexus since January.
My contract has been expired for over 4 years now, so I'm free to leave at anytime. I'm thinking about checking out Verizon, and if I can get a decent phone there I'm going to sell my Galaxy Nexus and move on. This was the last straw for me with AT&T; I get terrible cell service (just dropped a call with my father twice) in my city, and it's horrible really nationwide. I really don't want to sign a new contract with AT&T, even if I just turned around and sold the phone on eBay.
Motorola Droid Razr MAXX HD (Verizon)
Galaxy Nexus GSM* (AT&T)
Motorola Milestone* (AT&T)