Bissau: As the capital, Bissau has the most reliable network coverage in the country. You can expect consistent 4G/LTE connectivity in central areas like Bissau Velho and around the port. Signal strength is generally good outdoors and along major avenues. However, indoor coverage can be weaker inside older, thick-walled buildings or large concrete structures. Public transport like shared taxis operates above ground, so you'll maintain a connection while moving around the city.

Bafatá: In Bafatá, Guinea-Bissau's second-largest city, you'll find solid 3G coverage in the town center and along the Geba River. While some limited 4G may be available, 3G is more common for general browsing and communication. As you travel to the city's residential outskirts, the signal may become less consistent. Indoor penetration in buildings away from the main commercial streets can be variable.

Gabú: Located in the east, the market town of Gabú offers dependable 3G service in its commercial hub and administrative areas. The network is optimized for the bustling central market and main transport routes. Coverage can become spotty in the surrounding agricultural lands and more remote neighborhoods. Plan for potential signal drops when inside dense, single-story market buildings.

Bubaque: As the main hub for the Bijagós Islands, Bubaque has focused 3G coverage in the main town area, particularly around the port and major hotels catering to tourists. This allows for basic connectivity where most visitors stay. However, once you venture out to more remote beaches, nature reserves, or travel by boat to other islands in the archipelago, you should expect the signal to be very limited or completely unavailable.

Major Roads: Mobile signal is generally available along the main paved road connecting Bissau, Bafatá, and Gabu, though it can be inconsistent or drop completely in the rural stretches between these cities. Expect similar intermittent coverage on other primary roads, such as the route south to Buba.

Intercity Rail System: Guinea-Bissau does not have an operational public railway system, so connectivity on intercity trains is not a factor for travelers.

Bijagós Archipelago: Connectivity across this island chain is extremely limited. You may find a weak and unreliable signal in the main town on Bubaque island, but service is often nonexistent on most other islands and during inter-island boat travel.

Eastern and Southern Interior: Traveling away from the main Bissau-Gabu road into the eastern savannas near the Guinea border or the forested southern regions of Tombali and Quinara will lead to significant dead zones. Reliable signal is typically only found within towns.

River Crossings and Ferries: Expect signal to drop during ferry journeys across wide rivers and estuaries, such as the Geba River. Longer boat trips, particularly to the outer Bijagós islands, will have no mobile coverage for most of the duration.