It is "coming soon" to other countries. However, you can also download it anywhere you like, even without official support, on an Android device if you follow our handy guide or iPhone if you go through several steps.
Launch the App Store on your iPhone, tap on "Apple ID" at the bottom of the screen and sign out.
Now you need to change the region of your device. Go to Settings>General>Language & Region.
Tap on Region and change it to "United States" (or New Zealand, etc).
Head back to the App Store and search for Pokemon Go. "Get" it and hit "Install".
A pop up with ask you to sign in, but check "Create New" instead.
You have to fill out the required information and follow the instructions. Choose any email or US based address. It is important though to tap "None" for billing information, otherwise you need a credit card from the specific region chosen.
Head back to the App Store once the account has been created and you can download, install and play Pokemon Go as you are signed into a supported country.
One major problem with this method is that every time you want to use your existing apps and games, you have to switch your phone's region and sign back into your own country's account again.
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