Attached is basic overview of travel recommendations for Alaska Highway:
From above link detail about cell phone coverage along the route:
5. Is cell phone and internet service available?
There are long stretches of the Alaska Highway without cell phone service. Service will also depend on your U.S. provider’s coverage in Canada or your Canadian provider’s coverage in the U.S.
Cell phone service providers in Alaska include AT&T, Verizon and GCI. T-Mobile subscribers can gain signal via the Alaska-owned GCI network. Coverage is, for the most part, confined to the highway system, although there is no coverage (outside major communities) along the Denali, Elliott, Steese or Dalton Highways (except for Deadhorse/Prudhoe Bay). There are also “dead zones” found along all highways. Coverage is increasing in bush villages and available in large communities.
Alaska provider coverage is spotty to nonexistent along the Alaska Highway in Yukon and northern British Columbia outside major communities like Whitehorse, Fort Nelson, Fort St. John and Dawson Creek. There is coverage in major communities from the Yellowhead Highway south along the West and Central Access Routes in British Columbia. Coverage is good in Alberta along the East Access Route. Canadian travelers in Alaska and visitors from the Lower 48 in both Canada and Alaska will need to check with their cellular service providers regarding coverage and application of roaming and/or international rates.
Cellular service in western Canada is provided by Bell and Telus. According to
Yukon Tourism mobile phone coverage is available in all Yukon communities, but they suggest you check with your own mobile service provider to find out if yours will work in the Yukon. For the technically minded “Bell Mobility provides High Speed Packet Access (HSPA+) and Code Division Multiple Access (CDMA) digital cellular service in 17 Yukon communities.” There is no service provided for Globile System for Mobile (GSM) phones.
WiFi and hardwired internet access is available at many hotels/motels and campgrounds along the Alaska Highway, as well as at some visitor centers, libraries and coffee shops/cafes.