Minor correction: The SMS plans are $5 for 200 messages/month, $15 for 1500, $20 for unlimited, and $30 for unlimited on a family plan.
A couple of additional notes on the data plans: If you go over the 2GB, instead of overage charges, you can start a new data billing cycle — so if you use 3GB a month, you’re paying $25 every 20 days (on average). The new data plan is required for tethering, so you have to give up the grandfathered unlimited plan to get that.
Thanks for the correction... I appreciate it.