Yes. As long as the Paired iPhone is in bluetooth range, it should let you receive and send messages on the watch.
The iPhone must be turned on, and connected to a cellular network.
Wifi is not region dependent. You can get Wifi anywhere you get internet mostly. All you need is a Wifi router or access point you can buy in any electronics store.
Anyway, a GPS only watch can send and receive messages only if the paired iPhone is nearby. If there is no Wifi, it can do so with the iPhone over bluetooth if necessary.
The GPS Only watch only requires Wifi, if the paired iPhone is not nearby or turned on.
How to use your Apple Watch without your iPhone nearby - Apple Support
We can’t get internet up our street just yet. The cable companies have not run a line since we live so far out.
So the GPS only watch will allow me to send and receive texts and see who is calling if I’m connected through Bluetooth?
GPS vs GPS+ CELLULAR
