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Yes it does use your data. Even though it says you're connected to wifi the hot spot overrides it & uses your cellular data. I finally figured this out after months of questioning my cellular company as to how it was possible I could use that much data.ou cannot use your Wi-Fi connection for Internet connectivity while other devices are using Wi-Fi for Personal Hotspot. You can share only a cellular data connection; you cannot share a Wi-Fi connection. As seen here: http://support.apple.com/kb/ht4517. share | improve this answer.
But if navigation is only one feature you plan to use on your new unlocked smartphone, then go for it. There are tons of apps that you can download onto a smartphone that will work just fine with Wi-Fi instead of a carrier's data network.In fact, I am seeing more and more people use smartphones without data plans.While wireless carriers will require you to buy a data service plan if you connect your smartphone to their network even just for voice services, if you forgo the carrier network altogether, then you can just use Wi-Fi.here are several apps available that will allow you to download maps onto your device and use the Wi-Fi and GPS capability on the device for turn-by-turn navigation. And you don't need a data plan to do it. That being said, I don't think I would buy an unlocked smartphone for this purpose alone.