Many of the users have enquired how to change default country of samsung phones, mainly because of the promotional contents available in specific regions. This issue mainly occurs when device is purchased from country A and you live in country B and you need the device default to be Country B instead of Country A.
The solution is simple. Reset your phone with a sim card of your desired country, when the phone resets and restarts it will ask whether to load the default country settings or to load settings of the SIM card. Select the option to set SIM card location as default settings and the phone will reset again. Once the device bootsup the country will change to the location of the sim card inserted.