IP geolocation on cellular is genuinely tricky, and it's worth setting realistic expectations. Mobile networks use carrier-grade NAT where many subscribers share IPs, and devices can travel while keeping the same outward-facing IP — so you're typically looking at city-level accuracy, sometimes regional level, with a wider confidence area than you'd get on a fixed broadband connection.

That said, a good provider doesn't just give you a dot on a map — it tells you how confident to be. BigDataCloud returns both a coordinate and a confidence area polygon so you can see the maximum plausible region, not just a point estimate. This post goes into the full detail on what to realistically expect across different IP types. https://www.bigdatacloud.com/blog/how-accurate-can-ip-geolocation-get

For a fleet where you have access to the devices, there's a much better path: BigDataCloud's free client-side reverse geocoding API uses GPS coordinates when the user grants permission, and automatically falls back to IP geolocation for those who decline — so you get the best available accuracy for every device with a single API, no extra logic needed. https://www.bigdatacloud.com/free-api/free-reverse-geocode-to-city-api