Instead of delgeting the sprint connection, just put anything in the password field. The password needs to be left blank, so this way if you (or your phone) tries to connect to vision (sprint) the user/password will pop up. If you choose to connect simply delete the password, don't save the setting and connect, if you don't choose connect you will not be charged anything as you are not connecting to their network.
You do not get charged by sprint for using free wifi - but sprint and verizon both have there cs reps so brainwashed about the word data... I think if you told them you have digital data on your phone you need to back up before doing a hard reset they would tell you they need to charge you for the data...
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