Hello, I'm a newbie. I'm sorry if I'm being redundant and ask a question that has already been posted (I think I got the answer but just wanted to be sure

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I'm planning to get the HTC 8125 and I want to know if the following is possible.
1) use Yahoo Mobile (email/messenger) via wi-fi? When I'm at home I like to use wi-fi so I wouldn't have to pay $ for using the phone.
2) I plan to go with t-mobile prepaid card plan ... I don't think it would make any difference correct?
Thanks everyone!!! Cool Forum.