If it was more than a 20Mb sized chunk of data - yes, it will be restricted over Telstra 3G - as a safety feature designed to prevent people from getting $1,000 phone bills for excess data. I guess that satellite and ephemeris data is downloaded as a stream, so it doesn't have a definitive file size to work with up front which would tell it to go or not - meaning that it could cut it off at the 20Mb mark midstream as you hit the 3G limit.
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