What I'm thinking you want to do is have your phone dial out to your ISP to connect to the internet, to reduce internet charges. If you connect it to a modem card, then it might be possible, but I still doubt it. Typical analog modems listen for dialtone signal, to know if the line is active or not. Your mobile phone does not offer this. Technically, you will not be able to do it.
You're best option is to buy PDAnet. It allows you to use connect your PC to your Treo to connect to the internet and your provider will not know.
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