What is a Wi-Fi hotspot?
A Wi-Fi hotspot is a feature that turns your cell phone into a small router: it takes your existing mobile data connection and shares it via Wi-Fi with other devices, such as a laptop or a tablet. It's built into the operating system, both on Android and iPhone, with no additional apps or equipment needed.
Many people know it as "internet sharing," "tethering," or "mobile hotspot." These are different ways of naming the same thing: your cell phone acts as an intermediary between the carrier's network and the other devices you connect to it. The laptop doesn't need its own SIM card or data plan; it uses the cell phone's connection as if it were a pocket router, and this applies equally to a family member's phone or a travel companion's phone.
Its usefulness is especially noticeable when you're traveling. Imagine you arrive at an airport and need to check your itinerary on your laptop, upload some photos from your tablet, or let your partner check the map on their own phone, all at the same time and without relying on the hotel or the corner cafe having Wi-Fi available. With the hotspot activated, all those devices share the same connection your phone already has, wherever you are.
How does a hotspot work when you share mobile data?
The process is simpler than it seems. Your cell phone receives the mobile data signal (4G or 5G) from the carrier's antenna or, if you use a travel eSIM, from the local network in the country you're in. The hotspot takes that connection and creates a second network, this time Wi-Fi, with a name and password that you define. Any device that connects to that Wi-Fi network browses using the same mobile data from the cell phone, even if the device itself doesn't have a SIM card or its own plan.
It's important to understand one point that confuses many travelers: the hotspot doesn't generate new data; it only distributes the data that already exists in your plan. If your cell phone has 5 GB available, those 5 GB are consumed whether you use them directly on the phone or share them with your laptop via hotspot. There's no "extra" data allowance for the hotspot, unless your carrier or eSIM provider explicitly states otherwise.
The hotspot is not a new network or a magical connection: it's your own data plan, temporarily shared with another device. Everything that goes in and out first passes through your cell phone.
This also explains why the hotspot consumes battery faster than normal: the cell phone maintains two active radios at once, mobile data and Wi-Fi, in addition to processing traffic from each connected device. If you're going to use it for several hours continuously, it's a good idea to keep your phone plugged in or carry a portable charger.
How to activate the Wi-Fi hotspot on your phone?
Activating the hotspot takes less than a minute, and the process is similar on any modern cell phone, although the exact menu name changes depending on the operating system.
On an iPhone: go to Settings, tap "Personal Hotspot" (or "Share Internet"), toggle the switch on, and set a Wi-Fi password. The network name is usually the same as your phone's name, so if something distinguishes it in the list of nearby networks, now you know why.
On an Android: go to Settings, search for "Connections" or "Network & internet," then "Hotspot & tethering" (the name varies slightly between brands like Samsung, Xiaomi, or Motorola), and activate "Mobile hotspot." From there, you can change the network name and password, and see how many devices are connected in real time.
Once activated, you just need to search for that network's name from your laptop or other cell phone, as you would with any normal Wi-Fi network, and enter the password you configured. The connection works as long as the hotspot is on and your cell phone has an available data signal.
| Step | iPhone (iOS) | Android |
|---|---|---|
| 1. Locate the menu | Settings → Personal Hotspot | Settings → Connections → Hotspot |
| 2. Activate | "Allow Others to Join" switch | "Mobile Hotspot" switch |
| 3. Set password | Tap "Wi-Fi Password" | Tap "Set up mobile hotspot" |
| 4. Connect other device | Search for the network by name and connect | Search for the network by name and connect |
Hotspot with your local carrier or with a travel eSIM
This is where many travelers get an unpleasant surprise: activating the hotspot with your home carrier's SIM while in another country almost always involves international roaming. And roaming, unless you have a specific package contracted beforehand, can lead to high charges on your bill when you return, without you noticing while traveling.
The alternative that avoids this risk is to use a destination data eSIM, installed alongside your usual line. Your phone remains the same, your regular number still receives calls and messages, but the data used by the hotspot runs on the local network of the country, contracted in advance and with a clear limit that you chose yourself.
| Aspect | Hotspot with local carrier roaming | Hotspot with travel eSIM |
|---|---|---|
| Cost | Variable and sometimes unpredictable; depends on your contract with your carrier | Defined before traveling, according to the plan you choose |
| Activation | Automatic upon arrival (can activate without you noticing) | Manual, by scanning a QR code before or during the trip |
| Your usual number | Maintained | Maintained; the eSIM is added as a data line |
| Coverage | Depends on carrier roaming agreements | Local network of the country, designed for the destination |
| Spending control | Low if you don't check the contract before traveling | High: you know in advance how many GB you have |
If you choose the eSIM route, activation is quick (around 1 minute once the code is scanned) and you can purchase it up to 180 days in advance, because the activation period runs from the purchase, not from the moment you install it. This gives you time to have it ready before leaving home and activate it just upon landing.
How many devices can you connect to your hotspot?
Most modern cell phones allow multiple devices to connect to the same hotspot at once, though the exact number depends on the model and operating system, and you can check it in the hotspot settings menu itself. In practice, for a typical trip—you, your laptop, and maybe a companion's phone—that limit is rarely an issue.
What you should monitor is the speed, not the number of connections: each additional device using the hotspot at the same time (e.g., watching a video or downloading something heavy) shares the same bandwidth among all. If you notice your laptop is slow, first check if another device connected to the same network is consuming data in the background, such as automatic updates or cloud backups.
Is it safe to use your phone's hotspot in another country?
Yes, and in fact, it's usually safer than connecting your laptop to a public Wi-Fi network in a cafe, airport, or shopping mall. When you use your own hotspot, you control who enters: you define the password, you decide when to turn it on and off, and no one else shares that network unless you give them access.
Two practical recommendations to keep it that way: always use your own Wi-Fi password that is different from the factory default (avoid network names that reveal your identity, such as your full name), and deactivate the hotspot when you're not using it, both to save battery and to avoid leaving an unnecessarily open network. If you're also traveling with an eSIM, check that your provider's app confirms the active connection before sharing it, so you avoid doubts about whether the hotspot is using data from the correct line.
What activities consume the most data via hotspot?
Not all hotspot uses consume the same amount of data. Before sharing your connection with your laptop all day, it helps to know which activities weigh the most to plan how many GB you'll need for your trip.
| Activity | Relative data consumption | Recommendation |
|---|---|---|
| Email and text messaging | Low | Ideal for using the hotspot without worrying about the limit |
| Maps and GPS navigation | Low to medium | Download offline maps if you'll be using it for several hours |
| Video calls | Medium to high | Lower video quality if your plan is limited |
| Social media with video | High | Consumes data quickly with auto-play |
| HD video streaming | High | Better to download content beforehand with hotel Wi-Fi |
| Automatic updates and backups | High and sometimes invisible | Pause automatic laptop updates before traveling |
That last point is easy to overlook: a laptop can continue to consume data in the background, updating the operating system or syncing files to the cloud, without the person actively doing anything. Checking these settings before leaving home prevents your data plan from running out without apparent explanation.
Your own hotspot vs. public Wi-Fi in cafes and hotels
Free Wi-Fi in hotels, cafes, and airports seems like the most convenient option, but it has three common limitations: it's usually slower during peak hours because dozens of people share it, sometimes it requires registration with your email or cell phone number, and it doesn't always cover all the areas where you need a connection, such as on the way between the hotel and a point of interest.
Your own hotspot solves these three limitations at once: the speed depends on your own data connection, you don't share it with strangers, and it follows you wherever you go, not just within the Wi-Fi-enabled building. The trade-off is that it consumes from the data plan you've contracted, so the best strategy for most trips is to combine both: use hotel Wi-Fi for heavy tasks while you're there (updates, backups, streaming) and reserve your own hotspot for moving around the city.
What to do if the hotspot doesn't work during your trip
Before assuming there's a problem with the network or the eSIM, it's worth checking a few basic points that resolve most cases.
First, confirm that your phone has an active data signal (not just Wi-Fi) and that mobile data is turned on for the correct line, especially if you use dual SIM or eSIM alongside your usual line. Second, check that the hotspot is still on: on the iPhone, the personal hotspot function turns off by itself after a while without connected devices, as a battery-saving measure, so if your laptop disconnected and can't find the network again, simply go back to the Settings → Personal Hotspot screen on your phone to "wake it up" before the other device tries to reconnect. Third, verify that the password doesn't have a typo, which is more common than it seems when typing quickly from a laptop.
If the problem persists and you are using a PuraSIM eSIM, support is available 24/7 in all languages via email and WhatsApp, so you don't have to troubleshoot it alone from an airport with low battery. For a more complete review of common eSIM issues, you can check the guide on common eSIM problems.
Frequently asked questions
What is a Wi-Fi hotspot?
It's a phone feature that turns its mobile data connection into its own Wi-Fi network, allowing other devices—like a laptop or tablet—to browse using that same data, without needing their own SIM card or contract.
Does the hotspot drain battery faster than usual?
Yes. The phone maintains two active connections at once (mobile data and Wi-Fi) and processes traffic from each connected device, which increases battery consumption compared to normal phone use.
Can I use the hotspot on an airplane?
Not while the phone is in airplane mode without Wi-Fi enabled, as the hotspot relies on a mobile data signal, which is turned off in that mode. Some flights offer their own onboard Wi-Fi, but that's a different network, not your phone's hotspot.
Are hotspot and tethering the same?
Yes, they are different names for the same function: sharing your phone's data connection with another device, whether via Wi-Fi, USB cable, or Bluetooth.
How many GB do I need to use a hotspot during a trip?
It depends on usage: for email, messaging, and maps, a few GB are enough for several days. If you're going to share video or make frequent video calls from your laptop, a larger plan is advisable, as these activities consume more data per hour.
Do I need to install an app to activate the hotspot?
No. The hotspot is integrated into the operating system settings, both on iPhone and Android, and does not require any additional application to activate.
Can I use the hotspot with an eSIM instead of my usual line?
Yes. If you install a data eSIM for your destination country, you can share that data via hotspot just as you would with your physical line, without relying on your home carrier's roaming.
Why does my laptop disconnect from the hotspot by itself?
On iPhone, this is normal behavior: the personal hotspot automatically turns off after a period without connected devices to save battery. Simply reopen the hotspot screen on your phone to reactivate it.
In summary
The Wi-Fi hotspot is, at its core, a simple tool: it shares the data your phone already has with other devices, without the need for additional routers or networks. The part that's worth planning before you travel is where that shared data comes from. Using your home carrier's roaming can result in unexpected charges, while installing a data eSIM for your destination allows you to use the hotspot with a clear GB limit, contracted in advance, and without surprises upon your return.
If your next trip includes working from your laptop on the go, sharing maps with your travel companion, or simply not relying on hotel Wi-Fi, it's worth checking the international eSIM collection, with plans for over 200 destinations, before you leave home: you can purchase it up to 180 days in advance and activate it right upon arrival, in approximately 1 minute. If it's your first time using an eSIM, the guide on how to install an eSIM walks you step-by-step through the entire process, and what an eSIM is answers the most basic questions before you start. If you're not sure if your phone is compatible, first check the list of eSIM-compatible phones.
