https://www.samsung.com/ch...

To change the country associated with your Samsung A54, you need to change the country in your Samsung account. This is done via the Samsung website, not directly from the phone's settings.
Here are the steps to follow:
1. Go to the Samsung account website:
On your computer or mobile browser, go to account.samsung.com.
2. Sign in:
Use your Samsung email address and password to sign in to your account.
3. Edit your profile:
Go to your profile, then personal information, and you should find the option to change the country.
4. Select the new country:
Choose the desired country from the list and confirm the change.
5. Confirm the change:
Read the information displayed carefully, tick the box confirming that you understand the consequences, then confirm the change.
Important points to remember:
180-day waiting period:
You will not be able to change country again for 180 days (approximately 6 months) after the change.
Possible consequences:
Some services and features in your Samsung account, such as SmartThings, may no longer be available after the country change due to local laws and regulations.
Automatic sign-in:
Devices connected to your account will be disconnected after the change and you will need to sign in again.