tether should be able to use WiFi if exist. I have AT&T so I can connect to ATT wifi and if I do that my data usage doesn't get flagged because wthere is Unlmited WiFi and tether should support that as there is no way to use the Blackberry 8900 for it as a WiFi modem.
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There isn't low enough level for us to write code to create a WiFi connection, but we are looking at an alternative solution.
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Patrick Hankinson
Community Manager