[viscanti]

Install N apps where N is the number of markets you eventually travel to. If you only ever travel to one other market maybe 2 is fine. If you need to download tens or hundreds of apps that might be a bit much. Not everyone will travel to that many markets, but for those who do, they might care.

[isostatic]

1) Find out what the required app is 2) Keep them all uptodate 3) Keep your details registered with them, despite using them once every 2 years 4) Remember which app to use in which city

Uber just works. Sadly apart from where I live, which is like the 1990s in terms of taxi provision.