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No, you can’t upgrade without changing phones. You will notice that the one with cellular has a red dot on the stem. No dot/no phone.
Sorry, there was a problem. Please try again later.I currently have just the GPS because the GPS & Cellular were hard to come by when they were first sold/ The only difference is with the gPS, you have to be near your cell phone to use the phone app on the watch. With GPS + Cellular, you can actually leave your phone at home and just use your watch to make calls. Since I always have my phone with me anyways, I didn't see the need to pay the extra $$$ for the cellular. And No, you cannot add cellular later if you just buy the GPS version.
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