Does GPSLarp leave anything on my iPhone after I stop?

Nothing on the phone. It does not jailbreak it, modify iOS, or install a configuration profile, so there is no entry in Settings to delete afterwards. The trust pairing between the phone and the Mac remains, as does Developer Mode if you enabled it; both are Apple's own settings and both can be turned off from the phone.

Can I stop the location change if I am signed out or my subscription lapsed?

Yes. Stopping is deliberately not behind the sign-in gate. Almost everything else in the application requires a session, but leaving someone unable to undo what the application did to their phone because a token expired would be indefensible, so that control stays available.

Do I need to restart my iPhone to get the real location back?

No. The override lasts only as long as GPSLarp is running and holding the connection, so stopping, quitting or disconnecting ends it immediately. If an app on the phone still shows the old place, force-quit that app and open it again — it is holding a cached answer.

GPSLarpHelp

How do I put my real location back?

You changed the location and now you want the phone back the way it was — either because you have finished, or because something is not right and you want out.

Stop, or quit, or unplug. All three end it immediately. There is no restart, no reset, no setting to undo, and nothing was installed on the phone that needs removing.

01Three ways, all immediate

01Press Stop or Reset in GPSLarp

The direct route. The phone goes back to its own GPS straight away.

This works even if your session has lapsed. Almost everything in GPSLarp is behind being signed in; stopping deliberately is not. Leaving somebody unable to undo what this app did to their phone because a token expired would be indefensible, so that one control stays available whatever else has gone wrong.

02Quit GPSLarp

Closing the app ends the connection, and the override only exists while the connection does. Same result, no extra step.

03Disconnect the phone from the Mac

Unplug the cable, or take either device off the shared Wi-Fi network, or let the Mac sleep. The connection ends and so does the override.

This is also why the reverse is true and worth planning around: if you want a changed position to hold while you use the phone, the Mac has to stay awake, running GPSLarp, and connected.

02What is left behind

Nothing on the phone. GPSLarp does not jailbreak it, does not modify iOS, and does not install a configuration profile — there is no entry in Settings to find and delete afterwards, because none was ever created.

Two things that are unchanged and worth saying, because people go looking for them:

The trust pairing between the phone and the Mac stays. That is Apple's, it is the same one Xcode creates, and it is what lets the two devices talk at all. To remove it, see the reset described on Trust This Computer — and read what it costs first, because it clears every computer.
Developer Mode, if you turned it on, stays on. It survives restarts by design. Turning it off is Settings › Privacy & Security › Developer Mode, off, then restart. Worth doing if the phone is your everyday one — see Developer Mode.

03An app still shows the old place

Force-quit it on the phone and open it again. Swipe up from the bottom of the screen and hold to see the open apps, then swipe that one away.

An app that asked for the location once and cached the answer will keep showing whatever it was told, no matter what the system now reports. That is the app's cache rather than a location that is stuck, and it is by far the most common reason this looks like it has not worked. The same thing happens in the other direction and is covered on the location didn't change.

If a built-in app that came with the phone — the one with the map, or the compass — shows your real position, then the phone is back and anything else showing otherwise is holding an old answer.