So the answer to your question is yes! There is Wi-Fi service at Gokyo trek. Most of the tea houses and lodges offer you the internet although it can be spotty. Not only that cell phone networks can be found on the trek. Most of the places get cell phone coverage either by NCell or NTC networks. You can buy a Nepalese SIM card at the airport when you arrive. As in Nepal, your country’s SIM doesn’t work. Likewise, you can buy Wi-Fi cards for the adventure trek in Nepal.