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Within the contractual agreements/obligations, yes... If you exceed any data cap you have on your account, you will be responsible for overage charges that use of Maps might incur.No, it is free to use.
its one of those "yeah but" things... Yeah, it's free to use, but...mind your data cap...That goes for any app that uses data though. I'm pretty sure his question was geared towards the main use of the app and/or any in-app functions.