Three Pass Trek is a challenging trek and doable, due to the flow of tourists from around the world the region is filled with lodges, tea houses, and some excellent hotels to Namche Bazaar. As the Everest region has diverse trekking areas, but some areas are still remote in terms of modern facilities. Now, normally you will find Wi-Fi facilities in many of the lodges/tea houses (it depends upon the weather as well). Three Passes Trek is all to the Sagarmatha Conservation Area, so there is a restriction on the number of lodges and tea houses to be operated also the tea house and lodges are with a number of limited rooms and basic facilities due to the restriction by the conservation committee. However, to the lower altitude till Namche Bazaar, you can find a sufficient number of lodges and tea houses, as you descend uphill the number of tea houses and lodges diminish due to high altitude.