IP geolocation is increasingly not useful for anything, especially for mobile users. The best it can do is give you the correct country and maybe get you in the right region.
If you're on cell service.. yeah probably less accurate. Not sure if it makes the form harder to fill out if you have to change some of the fields.
What I've started doing for my personal app though is I've added a "guess" button. It fills in the form using heuristics but it's opt in. Fills out like 10 fields automatically and I've tuned it so it's usually right, and when it isn't correcting a few is still quicker.
Our country-level data (which is free) is 10-15 times larger than the free/paid country-level data out there. We constantly hear that the size of the database is an issue. The size is a consequence of accuracy in the first place. So, it is a balancing act.
By perfectly, I meant it got my city and zip correct, but I looked up the lat/lng and its a 5 min drive away. So pretty dang close!
Not sure how you got it that close if its only supposed to point to the nearest data center.
I am curious about your experience with us so far.