Question

In Pokemon go, there is a red banner on the top saying "GPS signal not found" what does it mean?

Answer 1

It means just what it says.

That red banner is telling you that a) you need to turn on your GPS on your phone or b) something is wrong.

Source: Experience

Comments

How do I turn on GPS on an iPhone

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Go into settings then go to:

Privacy - Location Services and then turn it on.