WiFi is available almost everywhere in cities and easy enough to find in most towns/villages so you can rely on having regular access during your trip. If you have data roaming switched on, then you'll be able to use the internet on your smartphone, but beware of the fees! WiFi is available at some of the accommodations that you'll be staying at, usually for a small cost so check this out at each location when you arrive, though it may be sporadic. There's no WiFi along the W-Trek Hike and cellphone coverage will be minimal.