WiFi with no data plan?

[dhp78]

Hi,

I had a LG incite with no data plan. I used to use it in wifi networks all the time with no problem. I had it set up so it would not use the carriers data network so I wouldn’t get charged.

Well, the phone had troubles with freezing and locking up all the time so the carrier’s warranty dept arranged a change to the Tilt 2. I tried using wifi like I used to and I got a big bill.

Can I use the Wifi networks w/o a data plan and w/o charges like I used to do with the Incite? How do I do this and make sure the data network is not accessed?