Planing to buy apple watch series 7 GPS

If you do not get your Apple Watch in your own country, you may have to return the Apple Watch to the country where purchased to get warranty service.

If you do not get your Apple Watch in your own country, there may be country specific restrictions in the installed Apple Watch software that prevent features from working when you get home.

https://www.apple.com/watchos/feature-availability

Warranty no.

Work - may not have all functions or features supported.

Buy the Apple watch in the country in which you intend to use it

to minimize any problems.

It’s a GPS model so you won’t have any problems with different cellular antennas, that’s for sure.