Odd issue & some tips from my experience:
1. I'm using an iPhone XS with no jailbreak, so getting a working GPS hack was an effort to start with. What I used is Desktop app, iMyFone, that allows you to change your location with a non-jailbreak iphone - you just need a laptop and a cable. Once you change your location to US your phone "keeps" it even after you disconnect the cable.
2. Take-off:
Switch on RC and connect to phone, start app and go to Camera view. Then I start up the drone, covering it with my hand (this is important because if the drone connects to GPS it "overwrites" the fake location and you need to restart). Once the drone connects to my RC (& phone) I go in the settings make sure I select a 5.8 Ghz channel.
3. Landing:
Unlike what others have said, if I do not disconnect my phone before landing as soon as I land I receive a message that my location has changed and new transmission settings will to be applied (overwrites the fake location). To avoid this I disconnect my phone and land the drone with the RC.
Odd issue:
Low probability that this is caused by anything else, and I am yet to make some test tomorrow in standard/hacked mode, but when flying with the hack the mini radar on the screen showing the location of the drone with respect to the RC is very much wrong. I would fly the drone visibly straight in front of me, but it would appear on the mini radar as it were 90 degrees to my left... When I open the mini map it shows that the drone has accurately updated its Home Point (e.g. I am not flying under US homepoint). Anyone else experiencing this? Any way to force-calibrate it to accurately track/visualize this?
This is quite annoying, but to be honest the overall improvement is so big, even when I am not pointing the RC perfectly directly at the drone I am getting higher range than before,.