Not to revive a dead thread, but 2-3 months on, has anyone using the n900 on the cheaper T-Mobile data plans gotten IMEI blocked? (e.g. $5.99 T-Zones, $9.99 web2go etc)

I'm currently on an almost 7 year old grandfathered T-Zones data plan... and I don't want to lose that. I usually turn off all background data usage and consume around 10-20MB or so per month.