$5.99 T-Zones data plan working with new APN
 

I have an unlocked 8310 Curve for T-Mobile and I have been trying to figure out a way to get my apps and my internet working using one of the apn's. I've been reading the forums and every thread I read says that you HAVE to HAVE the $19.99 plan for the internet and for your apps to work. Well I dont have that plan and my apps and internet work just fine. I'm using the epc.tmobile.com apn with the $5.99 t-zones plan and it works just fine. My only question is will I be charged for doing this? I have used the work around on my Dash and iPhone and have never been charged extra for data usage.