In short: to have internet on the island, you need an eSIM for Zanzibar, which is actually a Tanzania eSIM (the archipelago doesn't have its own coverage): you install it in Spain with Wi-Fi, activate it upon landing at Stone Town airport, and use the Vodacom or Airtel networks. With 3-5 GB, you'll cover a week at the beach without relying on hotel Wi-Fi.
eSIM for Zanzibar: the quick answer
For Zanzibar, you need a 3 to 5 GB Tanzania eSIM if you're going for a week-long beach trip. It relies on local operator coverage (Vodacom, Airtel, Halotel), you install it before flying, and activate it upon arrival. It's much more convenient than looking for a local SIM at the airport and avoids the surprise bill from roaming, which in Tanzania is not covered by European roaming regulations because, simply put, it's not the EU.
If you've never used a virtual eSIM, think of it as a SIM card that lives inside your phone: no plastic to insert, it downloads as a profile and coexists with your Spanish line without touching it. The key on the island is data management: mobile coverage is good in towns and tourist areas, but spotty on some stretches of road or remote beaches. With a well-sized plan, you'll have internet where you really need it. Let's start with the point that most confuses first-time travelers to Zanzibar.
Zanzibar is Tanzania: which eSIM to buy
Zanzibar is a semi-autonomous archipelago, with its own president and flag, but for telecommunications purposes, it is part of Tanzania. So don't look for a "Zanzibar eSIM" in any store: it doesn't exist as a separate product because the operators providing service on the island (Vodacom, Airtel, Halotel, Tigo) are the same ones that cover the mainland. What you need is a Tanzania eSIM, and that same eSIM serves you for both the beach and a safari in the Serengeti or for climbing Kilimanjaro if you extend your trip.
This gives you flexibility: if you combine beach time in Zanzibar with a safari on the mainland, you don't reinstall anything, you continue with the same data. The logic is always the same in East Africa: you buy by country, and Zanzibar counts as Tanzania. If you also like the Indian Ocean archipelago, check out our guide to eSIM for Comoros: another island where exactly the same thing happens, you buy the country's eSIM even if the tourist destination has its own name.
Coverage on beaches and in tourist areas
In Zanzibar's tourist areas, coverage is surprisingly good for an Indian Ocean island. In Stone Town, Nungwi, Kendwa, Paje, or Jambiani, you'll have plenty of 4G for maps, messaging, and uploading photos at a good pace. Vodacom and Airtel are the operators with the best coverage on the coast, and travel eSIMs rely on their networks depending on where you are.
The signal weakens on stretches of road between inland villages, in some bungalows next to the sea with thick coral walls that act as makeshift Faraday cages, and on excursions to islets like Prison Island or Mnemba, where there's directly no network. Nothing dramatic if you plan ahead: download the offline map of the area before leaving your accommodation and notify anyone you need to before losing coverage for a while. If you're concerned about overspending in a destination where data isn't exactly cheap, check out our tips for saving data on a trip. With 4G in the tourist area, you'll have most of your trip covered, especially if your plan isn't to do serious remote work from the beach.
Useful tip: on eastern beaches like Paje or Jambiani, your phone might connect to the nearest village's network and lose some speed at midday, when it coincides with low tide and everyone goes kitesurfing. If you're diving or sailing all day, download offline maps and booking confirmations before leaving your accommodation; there's no coverage at sea, regardless of your eSIM.
Internet from Zanzibar Airport
You arrive at Abeid Amani Karume Airport (ZNZ), in Stone Town. It's small, the immigration queue can be long, and the terminal Wi-Fi is limited, so having the eSIM already installed makes a real difference: as soon as you land and turn off airplane mode, you have data to coordinate the transfer to your hotel in the north or east, which is usually one or two hours away by car on a single-lane road.
The step almost everyone skips and then regrets: installing the eSIM in Spain with Wi-Fi, before leaving home, because you need a connection to download the profile. If you've never done it, the process takes five minutes following our guide on how to install an eSIM step by step. Leave it installed but don't activate the data plan until you land, so consumption doesn't start counting prematurely. This way, you avoid relying on the SIM card counter at the airport, where there's sometimes a queue and they ask for passport and fingerprint registration, a process that in Tanzania is not exactly fast.
How many GB for your trip to the island
On a beach trip, you use less data than it seems: a lot of time without looking at your phone while lying under a parasol, but with specific peaks when booking an excursion via WhatsApp or uploading photos of the sunset in Kendwa. This indicative reference helps you choose a plan without overdoing it or falling short:
| Duration | Travel profile | Estimated GB |
|---|---|---|
| 4-5 days | Beach and disconnection | 3 GB |
| 7 days | Beach week + excursions | 5 GB |
| 10-14 days | Zanzibar + continental safari | 10 GB |
| Any | Remote work / many photos and videos | 15 GB or more |
If you run short halfway through your trip, the solution is not to buy another eSIM: almost all of them can be topped up with more data without reinstalling anything, so take just enough margin and only extend if you really need to. What consumes the most, by far, are videos and video calls: if you're going to make some with family from the hotel, upgrade your plan one step compared to what the table indicates, because a twenty-minute video call on 4G can easily eat up what you would use in two days of maps and messaging.
eSIM, physical SIM, or roaming: what's best for you in Zanzibar
This is where it's worth taking a stance, because all three options exist and not all are equally suitable for everyone. Your Spanish operator's roaming in Tanzania is not like in the EU: there's no flat rate or regulated limit, so the cost can skyrocket without you realizing it until the bill arrives. It's worth first understanding what data roaming exactly is before assuming that "your plan already covers you," because outside of Europe, this is almost never the case.
A local physical SIM, bought at the airport or in a Stone Town shop, might be slightly cheaper if you stay more than two or three weeks, but it has a hidden cost: you lose your Spanish number while using it, you have to queue and show your passport, and if your phone is locked by your original operator, you won't even be able to use it. Compare it carefully in our guide on international SIM vs. eSIM before deciding.
For a trip of one to three weeks, which is typical for Zanzibar, the eSIM almost always wins: you install it at home, keep your WhatsApp number active with your Spanish line in parallel, and activate data right after landing. That said, if your trip is just a two-day stopover on the way to another destination and you'll spend almost all of it inside a resort with decent Wi-Fi, you probably don't need to spend on a multi-GB eSIM: hotel Wi-Fi for essentials and minimal data for transfers might be enough. It's not advisable to overbuy just in case.
Hotel Wi-Fi is not enough
Most hotels and lodges in Zanzibar advertise Wi-Fi in their bookings, but the reality on the ground is that the connection often comes via satellite or limited links shared among the entire accommodation, and it gets saturated in the evening when everyone is in their room reviewing photos from the day. For a video call, uploading a video, or opening Google Maps on the way to dinner outside the hotel, the Wi-Fi will let you down more than once, right when you need it most.
With an eSIM, you have your own connection, independent of the accommodation and also available outside the premises, at the beach restaurant or in the tuk-tuk back. If you also use public Wi-Fi networks at the hotel or a café in Stone Town, you might also be interested in learning about privacy and VPN while traveling, because a network shared by dozens of guests is not the ideal place to check your bank account.
Also, consider the pace of your trip: in Zanzibar, it's common to book a dhow sunset cruise, a spice tour in the morning, or a boat transfer to Prison Island to see the giant tortoises on the fly. All these bookings are made via WhatsApp with the local operator or hotel guide, and doing it from your own phone, without going to reception to beg for the Wi-Fi password, gives you a freedom that is highly appreciated in such an improvised destination.
Myths and mistakes almost everyone makes
There are a few common mistakes that repeat trip after trip and are easy to avoid if you know about them beforehand.
Searching for "Zanzibar eSIM" as if it were a distinct product. We've already said it, but it's worth repeating because it's the number one mistake: you waste time looking for something that doesn't exist as such. What you buy is a Tanzania eSIM.
Activating data right after installing the eSIM, while still in Spain. Many plans start counting validity days from activation, not from installation. Install the profile calmly at home, but don't activate it until you're about to take off or already at the destination airport: this way you don't lose a single day of what you've paid for.
Trusting that "it's a small island, the signal will reach everywhere." Zanzibar is over a hundred kilometers long and has inland areas with very low population; it's not a pocket-sized island. Coverage follows the main road and tourist centers, not the entire territory equally.
Not checking if your phone supports eSIM before buying. Sounds obvious, but it constantly happens with mid-range models from several years ago. Check your model before paying anything; the time it takes is less than the time lost disputing a refund afterward.
Thinking that a data plan includes calls or SMS. Almost no travel eSIM includes traditional voice: consumption is for data, and calls are made via WhatsApp or similar. If you need a local number for something specific, that's a separate issue.
Buying many more GB "just in case." In a destination like this, designed for disconnection, over-sizing the plan doesn't provide extra peace of mind: most plans can be extended on the fly if needed, so starting with just enough and topping up if necessary usually works out better than overpaying from day one.
Frequently asked questions
Is there an eSIM just for Zanzibar?
No. Zanzibar belongs to Tanzania for telecommunications purposes, so you buy a Tanzania eSIM that covers both the island and the mainland. This serves you for both the beach and a safari in the Serengeti if you extend your trip.
Is there good coverage on the northern and eastern beaches?
In Nungwi, Kendwa, Paje, and Jambiani, 4G coverage is good for maps, social media, and messaging. In isolated road sections, in some accommodations with very thick coral walls, or on excursions to islets, the signal might weaken, so it's advisable to download offline maps just in case.
How many GB do I need for a week at the beach?
With 5 GB, you'll have plenty for a week at the beach with some excursions. In a destination for disconnection, you use little data: maps, WhatsApp, and some social media. You'll only need more if you work remotely or upload many videos daily.
Is an eSIM better or should I buy a SIM at the airport?
For stays of one to three weeks, an eSIM is usually more convenient: you install it at home, and it works as soon as you land, without queues or passport registration at the counter. A local physical SIM might be slightly cheaper for very long stays, but you lose time with the process and your Spanish number becomes unusable while you use it.
Can I use the same eSIM in Zanzibar and on a safari in mainland Tanzania?
Yes. Since it's a Tanzania eSIM, it covers both the archipelago and the mainland. With a single installation, you have data on Zanzibar's beach and on safari in the Serengeti or Ngorongoro without changing anything or reinstalling the profile.
Does my Spanish operator's roaming work in Zanzibar?
Technically yes, but Tanzania is outside the European Union, so the flat roaming rates you have within the EU do not apply. The cost can skyrocket without prior notice; it's advisable to check the current price with your operator before leaving mobile data activated by default upon landing.
When is it NOT worth buying an eSIM for this trip?
If your stop in Zanzibar is a very short one or two-day layover, you'll be spending almost all your time inside a resort with Wi-Fi that you've already confirmed works well, and you don't need data for transfers or to book anything on the fly, you can probably manage without buying additional GB. This is not the most common situation, but it exists.
Conclusion
In Zanzibar, hotel Wi-Fi will often let you down right when you need it most; a low-GB Tanzania eSIM gives you your own internet on the island and on the mainland, without roaming surprises or airport queues. Install it calmly at home, activate it upon landing in Stone Town, and enjoy the beach with the peace of mind of being connected only when you choose to be. Get your Tanzania eSIM ready before flying to Zanzibar.
