Sprint Pocket PC help

I have a pocket pc and I wanna know how to block sprints internet from my phone. I have wi fi at my house and I use that all the time but it still connects to sprints internet and charges me not the wi fi. Sprint says they blocked it but it still lets me access it

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To connect to the Internet via Sprint:
1. Obtain the following information from Sprint:
 ISP server phone number.
 User name.
 Password.
2. Tap Start > Settings > Connections tab > Connections.
3. Tap Add a new modem connection.
4. Enter a name for the connection, and then select a modem from the list box.
For example, if you want to use the mobile phone network, select Cellular Line.
5. Tap Next.
6. Complete the connection wizard by entering the required information. Then, tap Finish.

Delete this info and you should lose internet.