The Swisscom Home App is only available in the Swiss App Store.

You can change the country at iOS as follows:

1. Open "Settings"
2. Tap your name, then tap "Media & Purchases"
3. Tap "View Account". You might be asked to sign in
4. Tap "Country/Region">"Change Country or Region" and choose Switzerland
5. Tap "Agree" in the upper-right corner, then tap "Agree" again to confirm.
6. Select a payment method and enter your new payment information and billing address, then tap "Next"

You can change the country in Android as follows:

1. Open the Google Play Store on your mobile device
2. Tap the three dash Account Country and Profiles menu
3. Tap the country you want to add an account to
4. Select a new payment method and enter your new payment details and your new billing address

It may take a few days for the changes to be applied.