I subscribed last week to the post paid Tablet data plan on a month to month plan. I have a Dell Streak and use 3G or Wifi for my calls using my VOIP plan. So ive subscribed in person and they did asked me for my IMEI.
25$ for the sim card and 35$ activation.
20$ for the first 500 megs or 35$ maximum for up to 5gigs
no 911 fees or network access fees also
If you have phone, internet or TV with them you may be eligible for a 5$ multi-service rebate
I have tried the sim card in my laptop's built in 3G receiver and it worked, but will know on my next bill how they will charge the data. Also i made a 1 min phone call (even if its a tablet data plan) and will also see how it is charged.
I will report back