Direct answer
Mobile coverage exists near towns and some park gates but is patchy deep in the bush — Uganda and Kenya SIM cards are cheap for data; do not rely on signal for gorilla trek coordination.
Recommended Uganda safari tours
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3 Day Uganda Gorilla Trekking Safari
You visit: Entebbe (Start), Bwindi Impenetrable National Park, Bwindi Impenetrable National Park, Entebbe
Uganda · Mountain gorillas · Bwindi focus
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5 Day Gorilla & Chimp Safari
You visit: Entebbe (Start), Kibale National Park, Bwindi Impenetrable National Park, Entebbe (End)
Uganda · Gorillas & habituated chimps
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6 Day Gorillas, Chimps & Wildlife
You visit: Entebbe (Start), Kibale Forest, Queen Elizabeth NP, Bwindi Impenetrable Forest
Uganda · Primates & savannah wildlife
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7 Day Uganda Wildlife & Gorilla
You visit: Entebbe (Start), Murchison Falls NP, Kibale Forest, Queen Elizabeth NP
Uganda · Nile, chimps, wildlife & gorillas
3 Day Murchison Falls Safari
You visit: Entebbe (Start), Murchison Falls NP, Entebbe (End)
Uganda · Nile boat & Big Five potential
10 Day Ultimate Uganda Safari
You visit: Entebbe (Start), Murchison Falls NP, Kibale Forest, Queen Elizabeth NP
Uganda · Extended flagship circuit