This sounds like location based apps are defaulting to the country you are in. You could try going into each app settings & see if you can turn auto-locate off, then enter your preferred location manually. Naturally you can always go into sites like Amazon via the browser, the app is after all only a convenient link (you could have a shortcut displayed on the home screen as well, set it up in browser settings).
You can turn off location for all apps in settings - location access.
I'm trying to work out what else you mean by this - can you provide some more examples. Apps such as BBC iPlayer, and TV Catchup won't work outside of the UK, sadly that is because of legal restrictions. Using a VPN will get around this, there are quite a few companies that supply these quite cheaply.
As I said, without knowing a little more about your problem, it's difficult to advise.
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