Here’s my take on this.
I can see both sides of the argument when it comes to precision versus reliability. GPS is by far the more accurate of the two, often pinpointing a location down to a few meters. However, its major weakness is that it requires a clear line of sight to satellites, which means it performs poorly indoors, in dense urban areas, or even underground.
A SIM tracker, which typically relies on cell tower triangulation, is less precise. The accuracy can range from a city block in urban areas to a few kilometers in rural ones. Its key advantage, though, is that it works indoors as long as the phone has a network signal. So, you’re trading pinpoint accuracy for a more consistent, albeit broader, location estimate, especially when the device is inside a building.