Haven't yet had to change my service location. It's still using my residential address circa 2,344km away from me. From time-to-time the app displays "not in service address" for a couple moments then it disappears. Roaming is disabled / wasn't even an option when first started doing this.
Interesting. What I noticed was that without changing service address, it would be in search mode for hours without going online. After the change, it would come to life in minutes. I did my trips late last year. I'm sure things are changing fast week to week as more satellites (and thus more bandwidth) is put into orbit.
