Then, your next choice are mapping- and survey-grade receivers with corrections, but you need several thousands of Euros. From my point of view, if you'd omit smartphones, you can also omit recreational-grade and mapping-grade receivers without differential corrections (as these give you slightly higher accuracy for significantly higher price). I don't know if the phone could use the cell antennas to set the location, if so it'll have an accuracy on perhaps 200.
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The top option in the settings menu is Save Location. First, fire up the camera, then tap the three lines in the upper left corner to open the menu. Tough if you are surrounded by tall buildings it might not be any more accurate than 30-40 meters. The following method is specifically for Google Camera, which is available on most stock Android devices, like Pixel or Nexus. Now this is changing, but the data could be still insufficient due to poor antena design. Geolocation data is most likely picked up from the GPS, which is accurate down to a meter or two in the right surroundings.
![google pixel photo geotag not accurate google pixel photo geotag not accurate](https://i1.wp.com/gadgetfeatures.com/wp-content/uploads/2020/02/Fix-Google-Pixel-4A-GPS-Issue-With-Accuracy-Calibration-Problems.png)
However, until recently, smartphones did not provide raw data needed for such calculations. In order to achieve centimeter or even decimeter accuracy you need differential corrections between two GNSS receivers (currently this is often solved using permanent observational services).
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Due to miniaturization in cell phones they use primitive patch antennas, which cannot mitigate negative effects (multi-path etc.). I'm big fan of smartphones, but from my point of view, there are two significant drawback.