@dooglad - yes I turned off the wifi, as I had read to do on other posts, and it still wouldnt work. So I called PP (and this time somebody knew what she was talking about) and they said it was because my phone used up all my data time the first day I had it and thats why I couldnt DL anything! OMGosh I had no idea it could do that. She said it uses data even if you arent meaning to. How do I fix it so that when Im home it will be on my wifi and also some kind of fix that wont use up all my data when Im not even online or DLing anything.... this is all so new to me!
Whenever you are on WiFi, the Eris will always use WiFi for data (with the exception of sending and receiving MMS messages, as previously discussed.)
You can add a widget to a home screen (it's under HTC widgets, then settings, I think it's called Mobile Data) that you can use to toggle mobile data off. That way you will only use mobile data when you want or need to - toggle it on when you are out and about and need to get or send information through apps, etc. It will still allow you to make and receive phone calls and text messages, but it will not use 3G for data. (Note that you can also toggle by long-pressing the power button - there is a setting there for toggling mobile data.)
Note that apps like twitter, facebook, etc., are often set to poll for data on a fixed schedule, as is the email app, and gmail and Google sync services are always waiting for data to send (if you change a contact or calendar item on the phone, or on Google calendar, or receive a gmail message, if you use gmail) so the phone can definitely use data in the background when you think that it is not. In fact, that big, pretty HTC clock and weather widget is set to update the weather on a periodic basis - I think that it's hourly, though it may be every three hours.
Good luck and let us know if you have any more questions. There are other ways to automate toggling data on and off, such as using the app JuiceDefender. I do wish that there was an app that would allow you to limit data usage for apps on an app by app basis for plans like your Pageplus data plan, but for now that seems to only exist for non-Verizon phones and for the lastest version of Android, version 4.0 (also known as Ice Cream Sandwich). The Eris stock runs Android 2.1 (also known as Eclair.)