Zanzibar is better connected than most people expect and less evenly connected than the coverage maps suggest. Stone Town and the Kiembi Samaki side of the island carry genuine 5G, the northern hotel belt around Nungwi and Kendwa is well towered because of how many resorts sit there, and the east coast is a patchwork where your experience depends on how far your guesthouse sits from the nearest mast. The network that consistently performs best here is Yas, which absorbed Zantel, the operator founded on the island in the late 1990s and the reason Unguja has a denser tower grid than its size would justify. A travel eSIM lets you have that without the passport-and-fingerprint counter every physical Tanzanian SIM requires.
What This Guide Covers
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Which Network Wins on Unguja
Four operators cover Zanzibar, and the ranking here is genuinely different from the Tanzanian mainland. Yas is the island's strongest performer. It was Tigo until the Axian group rebranded it in November 2024, and it had already swallowed Zantel, which was founded in Zanzibar and built the archipelago out far more heavily than a market of roughly 1.9 million people would normally warrant. That legacy grid is still standing and still the reason a Yas phone tends to hold a signal in Jambiani where others waver.
Airtel is the useful second choice. It is genuinely fine in Stone Town, at the airport, and along the main resort strips at Nungwi, Kendwa and Paje, and it competes hard on bundle price. Push into the island's interior, the Jozani forest side, or the quieter southern villages and it thins noticeably faster than Yas does. Vodacom is a curious case: nationally it is the coverage leader and the network any safari operator will tell you to buy, but on Unguja specifically it is merely good rather than dominant, because the island was never its stronghold. Halotel built for rural mainland districts and is the weakest fit for a Zanzibar visitor.
What speeds to actually expect
In Stone Town and around Zanzibar Town you can see 5G on Yas and comfortable double-digit 4G speeds on all three main networks, which is plenty for video calls. Out in the beach villages you are on 4G, and the honest range is wide: strong enough to stream in Paje near a tower, slow enough to make a WhatsApp voice note stutter in a bungalow at the far end of Jambiani. National average mobile speeds in Tanzania sit in the low teens of megabits, and Zanzibar broadly matches that outside the town.
Stone Town: The Best Connected Part of the Island
Stone Town is where Zanzibar's connectivity is unambiguously good, and it is also where the built environment fights back hardest. The old town is a warren of coral-stone buildings with thick walls and alleys barely wide enough for a scooter, and that geometry does what it does everywhere: your signal outdoors on Kenyatta Road is excellent, and two turns later inside a converted merchant house it can drop a bar or two. Rooftop bars, unsurprisingly, are where everyone's data works best.
Practically, this matters more for navigation than for anything else. Offline maps of Stone Town are close to useless because the alleys are unnamed and half of them are not mapped accurately in the first place; getting genuinely lost between the Old Fort and Darajani market is a rite of passage rather than a failure. Live data with a working connection is what gets you back out, so this is one place where the eSIM earns its keep.
Three Stone Town connectivity notes
Forodhani Gardens: the seafront night market is wide open to the sky and the signal is strong, but it gets busy enough after sunset that speeds sag on any network. Fine for messaging, less good for uploading video on the spot.
Around Darajani and Michenzani: this is where the town's real commercial density sits, and where the operator shops are. Coverage is the most consistent in Stone Town here.
Power cuts: Zanzibar draws its electricity from an undersea cable from the mainland, and island-wide outages, while much rarer than a decade ago, do still happen. Hotels run generators; cell sites run on batteries that do not last indefinitely. If the lights go out across town, do not assume your eSIM has failed.
Coverage by Beach: North Coast versus East Coast
This is the section that changes how you book. Zanzibar's beach areas do not behave alike, and the difference between the developed northern tip and the strung-out east coast villages is real.
| Area | Coverage | What to expect |
|---|---|---|
| Nungwi | Very good | The island's densest concentration of hotels, and the towers follow the money. Reliable 4G on the beach and in most rooms, with some congestion at peak evening hours in July and August. |
| Kendwa | Very good | A few kilometres south of Nungwi and served by the same infrastructure. Fine everywhere along the resort strip; the walk between the two beaches along the shore can dip. |
| Paje | Good | The best-served of the east coast villages and the reason kitesurfers and remote workers cluster here. Several cafes and coworking spots run decent fixed connections as well. |
| Jambiani | Uneven | A long, thin village strung along several kilometres of shore. Guesthouses near a mast get comfortable 4G; places at the far ends report noticeably weaker signal, sometimes enough to break a video call. |
| Michamvi | Variable | The peninsula north of Bwejuu is quieter and less densely built. Coverage is usable near the main lodges and around Michamvi Kae, thinner on the tracks between them. |
| Matemwe and the northeast | Adequate | Fine at the larger properties facing Mnemba, patchier in the village itself and along the coastal road south. |
The pattern is simple once you see it: on Zanzibar, signal quality tracks proximity to the nearest tower far more than it tracks which network you chose. Travelers who report brilliant 4G in Jambiani and travelers who report barely-working data in Jambiani are frequently on the same network, staying two kilometres apart. If reliable data matters to you, it is worth asking your accommodation directly how their guests find mobile signal, which is a more useful question than asking about WiFi.
Hotel WiFi, Coworking and Why You Still Want Mobile Data
Almost every hotel and guesthouse on Zanzibar advertises free WiFi, and a fair number of them deliver something usable. The catch is what that WiFi is made of. Outside the larger resorts, the typical setup is a fixed line or a mobile router feeding a handful of access points across a property built out of concrete and makuti thatch, shared by everyone at dinner. It works for messaging and it frequently does not work for a video call at 8pm.
The picture has improved markedly with satellite internet arriving at the higher-end properties, and some beach hotels now advertise it explicitly. Where a property runs it, evening speeds are transformed. Where a property does not, your own mobile data is often faster than the WiFi you were promised, particularly in Nungwi and Paje where the cellular network is strong.
Where free WiFi is genuinely reliable
Stone Town cafes are the safe bet, and the coworking spaces that have grown up around Paje and Jambiani to serve the kitesurf-and-laptop crowd sell day passes with connections built for actual work. Restaurants along the Nungwi strip generally have something. What none of these solve is the in-between: the dala-dala ride, the spice farm, the boat back from Prison Island, the moment your driver is looking for a turning that does not exist on the map. That gap is what mobile data is for.
Getting Around the Island With Data
Zanzibar has no ride-hailing worth relying on. Uber and Bolt do not operate meaningfully here, so getting around means taxis arranged through your hotel, private transfers, rented scooters, or the dala-dala, the converted truck-and-minibus network that serves the island's villages.
Dala-dalas run by numbered route from Darajani market and Creek Road in Stone Town. Route 116 heads to Nungwi, leaving roughly every half hour from early morning until around 9pm; the east coast routes serve Paje and Bwejuu; fares are typically TZS 2,000 or so per journey, occasionally with a small extra charge if you are travelling with a large bag. They leave when full rather than to a timetable, they are slow, and they are the cheapest and most sociable way to cross the island by an enormous margin.
Agree taxi fares before you get in
Without a metered app, everything is negotiated. Common island rates run around $15 to $20 for Stone Town to the airport, $35 to $40 across to Paje or Jambiani, and $45 or so up to Nungwi. Your data connection is what lets you check a rate or message your hotel before agreeing.
Watch the signal on the cross-island roads
The tarmac routes from Stone Town to the east coast and the north are covered for most of their length, but the stretch through the middle of the island past Jozani has thinner patches. Download your route before you set off if you are self-driving or on a scooter.
Ferries to Dar and Pemba
The fast ferry across to Dar es Salaam takes around two hours. You hold a signal leaving Zanzibar harbour and picking up again on the approach to Dar, with a genuinely dead middle section in open water. The Pemba crossing is longer and emptier still.
Day Trips: Jozani, Mnemba, Prison Island and the Spice Farms
Zanzibar's classic excursions all leave the tower-dense zones to some degree, and it is worth knowing which ones actually cut you off.
Jozani Chwaka Bay National Park, home of the red colobus monkeys, sits in the middle of the island on the main southeast road. Coverage at the entrance and car park is fine; on the mahogany boardwalk through the mangroves it becomes intermittent. You will not lose contact for long, but do not plan a call from inside the forest.
Spice farm tours around Kizimbani and Kidichi, inland from Stone Town, generally have workable signal because they sit in populated farming country. This is one excursion where you can keep uploading as you go.
Prison Island (Changuu) is a twenty to thirty minute boat ride from Stone Town, close enough that you are still in range of the town's masts for most of the trip and on the island itself. Snorkelling at Mnemba atoll off the northeast coast is the opposite: you are out on open water and coverage is unreliable, so agree pickup arrangements with your boat before leaving shore.
The Safari Blue problem
The full-day boat trip out of Fumba on the southwest coast, sold everywhere as Safari Blue, spends hours on sandbanks and in the Menai Bay lagoon. Signal out there ranges from weak to absent depending on where the dhow anchors. Take screenshots of anything you need, tell someone your plan, and treat the day as offline. The same applies to any multi-hour dhow excursion, which is a fair share of what people come to Zanzibar to do.
Frequently Asked Questions
Which mobile network performs best across Zanzibar itself?
Yas, formerly Tigo. It merged with Zantel, the operator founded in Zanzibar in the late 1990s, and inherited an island tower grid far denser than the local population would normally justify. That is why Yas holds up in places like Jambiani and Michamvi where rivals waver, and why it carries the fastest 5G in Zanzibar Town. Airtel is a solid second, good in Stone Town and along the resort strips but thinner inland. Vodacom is the mainland coverage leader but only average on Unguja.
Can I work remotely from a beach in Paje or Jambiani?
In Paje, comfortably, which is why the kitesurf-and-laptop crowd concentrates there and why coworking spaces have opened selling day passes. Jambiani is more of a lottery, because the village stretches for several kilometres and signal quality tracks how close your guesthouse sits to a mast far more than which network you use. If your work depends on video calls, ask the property directly how guests find mobile signal, and treat that answer as more meaningful than their WiFi claim.
Is the hotel WiFi on Zanzibar good enough to skip mobile data?
Usually not. Most properties outside the top tier run a modest connection shared across everyone at dinner, so it handles messaging and struggles with an 8pm video call. Higher-end hotels have started running satellite internet, which changes the picture completely where it exists. Either way WiFi stops at the property gate, and the parts of a Zanzibar trip where you most want data are the transfers, the dala-dala rides, the spice farms and the moment a driver cannot find your turning.
Will I have signal on a dhow trip or out at Mnemba?
Not dependably. Anything that takes you onto open water loses coverage: Mnemba atoll snorkelling, the long Safari Blue day out of Fumba into Menai Bay, and the middle of the ferry crossing to Dar es Salaam are all effectively offline stretches. Prison Island is the exception, since it sits close enough to Stone Town to stay within range. Screenshot what you need, confirm pickup arrangements before you leave shore, and plan those days as time off the grid.
Do I need to buy a local SIM once I arrive on the island?
You do not have to. Every physical Tanzanian SIM requires the shop to copy your passport, photograph you and scan your fingerprints for verification against immigration records, which takes anywhere from five to thirty minutes depending on whether the link is working. A travel eSIM sidesteps all of it and is live when you land. A local SIM is worth the errand for stays over about three weeks, where the much cheaper shilling bundles add up, or if you need a Tanzanian number to call drivers and guides directly.