Do all Smart phones have GPS built in?
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Welcome to the Republic Community!
Most US cell phones do have GPS.
Here is a pretty good article that should help answer you question in more detail
Is there a specific phone you’re interested in? It would definitely be easier for the Community to help you determine whether a few specific phones have GPS functions built into them, than to try to guarantee every smart phone does.
That said, every phone supported for use with Republic has GPS.