Is it the dual SIM model?
Usually it´s not restricted by the manufacturer. You will have to to something like this:
Backup all data from your SD card, (via USB to PC) or it will be deleted.
This "how to" is almost identical in all versions of Android with slight deviations:
https/www.youtube.com/watch?v=MDv_UUEl_l4
This might help as well:
http
/www.tomsguide.com/forum/id-3193148/make-card-int...