What is a hotspot and what is it used for when traveling?
A hotspot is a feature on your cell phone that converts its mobile data connection into its own Wi-Fi signal, allowing other devices—a laptop, a tablet, a friend's phone—to connect to the internet through it. It doesn't add new data; it distributes the data you already have contracted.
When traveling, a hotspot solves a very specific problem: you need internet on your laptop or another device, but that device doesn't have a SIM card or its own data plan. Instead of searching for a cafe with Wi-Fi or relying on the hotel's network, you use your own phone's data connection as a starting point.
It's important to differentiate between two things that are often confused: the hotspot is the function that distributes the signal, and mobile data is the fuel that this function distributes. If your phone doesn't have active data—for example, because you haven't purchased a plan for that country—the hotspot will turn on, but it will have nothing to share.
How do hotspots work, step-by-step?
The process behind a hotspot has three steps, although on the screen it looks like just one:
- Your phone receives data from the mobile network (4G or 5G) using the active line at that moment: your local plan, your carrier's international roaming, or a data eSIM you installed for the trip.
- The phone creates its own Wi-Fi network, with a name and password that you define (or that are set by default), and transmits it via its internal Wi-Fi antenna.
- The other device connects to that network as if it were any Wi-Fi, and from there browses using the data the phone is receiving from the mobile network.
There are three ways to share that connection: via Wi-Fi (the most common, with more range), via Bluetooth (slower, but uses less battery), and via USB cable (the most stable and consumes the least battery, because the other device charges the phone while browsing).
What happens if you activate your phone's hotspot?
When you activate the hotspot, three things change immediately. First, your phone starts to consume more battery, because it keeps two antennas active at once: the mobile data antenna and the Wi-Fi antenna. Second, all data traffic generated by connected devices—yours and others'—is deducted from your phone's data package, not a separate one. And third, if your plan has a data limit, that limit will be reached faster, because now multiple devices are sharing it instead of just one.
There's a nuance worth knowing: some carriers separate, within the same plan, the data you can use "on the phone" from the data you can share "via hotspot," and set a lower cap for the latter. If you notice that the hotspot stops working before your general data package runs out, that's usually the reason. It's advisable to check this condition directly with your carrier before traveling, as it varies depending on the plan and country.
How do you use the hotspot on Android and iPhone?
On both systems, the path is similar, although the menu name changes:
- On Android: Settings → Network & Internet (or "Connections") → Portable Wi-Fi Hotspot / Personal Hotspot. There you define the network name, password, and, on some models, the data limit you want to allow.
- On iPhone: Settings → Cellular → Personal Hotspot (or Settings → Personal Hotspot directly). iOS shows you the generated password and network name, which you can change from the same menu.
Once activated, simply search for that network from the other device, enter the password, and connect, just like to any home Wi-Fi. If your phone is an eSIM-compatible model, it's a good idea to check which phones are eSIM-compatible before your trip, as this determines whether you can use a travel data line in parallel to your main line without touching the physical SIM.
How much does a hotspot cost?
Activating the hotspot itself has no additional cost: it's a feature already included in your phone's operating system. What does cost is what it shares, i.e., the mobile data behind that function. And that cost depends entirely on which line is feeding the hotspot at that moment.
If you use your local plan within your country, the cost is already included in what you pay each month. If you use international roaming with your home carrier while traveling, the charge depends on the conditions of each carrier and each country, and can vary significantly from one destination to another; to know a real figure, you need to check directly with your carrier before your trip, as it changes frequently. If, on the other hand, you use a travel data eSIM, the cost is set in advance in the package you purchased, which makes it easier to calculate the total expense before leaving home.
A hotspot is not a source of internet: it's a bridge. The actual speed and cost always depend on the data signal that powers it—your local plan, your home carrier's roaming, or a travel eSIM—never on the hotspot itself.
Hotspot with roaming vs. data eSIM: which is better?
When traveling, you essentially have three ways to power your phone's hotspot: your home carrier's international roaming, a local physical SIM you buy upon arrival, or a travel data eSIM you install before you leave. Each has a different logic.
| Method | What you need to do | Main advantage | Main limitation |
|---|---|---|---|
| Roaming with your home carrier | Nothing: it activates automatically upon arrival in the country | Zero setup, same number | Unpredictable cost; varies by carrier and country |
| Local physical SIM | Buy it and swap it upon arrival at the airport or store | Usually good local price | You lose your number while using it; need to find a store |
| Travel data eSIM | Buy and install it before leaving, from home | Keep your number; price and data defined before traveling | Phone must be eSIM compatible |
If the plan is to use the hotspot to work from your laptop for several days, the most important variable is usually the predictability of cost and data volume, rather than the price per gigabyte itself. You can read more about the comparison between eSIM and traditional roaming if you want to delve deeper into the differences before deciding.
How many devices it supports and how to conserve battery
Most modern phones allow multiple devices to connect to the same hotspot simultaneously, although the exact limit depends on the model and operating system. In practice, the more devices that connect, the faster both the phone's battery and the available data package are depleted, as each consumes on its own.
| Sharing method | Battery consumption | Typical speed | When it's suitable |
|---|---|---|---|
| Wi-Fi Hotspot | High | Fast | Multiple devices, short duration |
| Bluetooth Hotspot | Low | Slow | Single device, light use (email, messages) |
| USB Cable Hotspot | Practically none (charges the phone) | Fast and stable | Long laptop work sessions |
One detail almost no one checks, but which does make a difference: most phones allow you to choose, within the hotspot menu, whether to transmit on the 2.4 GHz or 5 GHz band. The 5 GHz band is faster but has less range and consumes slightly more battery; the 2.4 GHz band is somewhat slower, but reaches further and uses less. If you're sharing the hotspot with several people in a hostel room or from a cafe table with your laptop across the room, switching to 2.4 GHz usually solves more connection problems than restarting the phone.
Security risks when sharing a public hotspot
Your own phone's hotspot is generally more secure than connecting to an open public Wi-Fi, because you control who connects with the password. Even so, it's advisable to take some basic precautions when using it in crowded places, such as airports or terminals.
- Change the default network name and password before traveling, not at the moment of use.
- Use a password that you share only with the people you genuinely intend to share the hotspot with.
- Occasionally check the list of connected devices from the hotspot menu itself, to confirm that there's no one you don't recognize.
- Avoid leaving the hotspot permanently on when not in use: besides draining battery, it leaves the network visible to anyone nearby.
If you're also interested in understanding the most common technical issues when using a travel data line, you can check this guide on common eSIM problems and how to solve them.
Real-life example: a business trip with a hotspot
Imagine you're traveling from Mexico City to Bogotá for five days, for a series of work meetings. You have your phone and laptop, and you need stable internet on your laptop from the hotel, from a cafe between meetings, and occasionally from the taxi while checking email.
Before leaving, you install a data eSIM for Colombia on your phone, without touching your main line. Upon landing, you activate that line, confirm you have a 4G or 5G signal, and turn on the hotspot from the Settings menu. On your laptop, you search for the network you just created, enter the password once, and from that moment on, your laptop browses using the data from that eSIM, without relying on the hotel's Wi-Fi or public networks.
During the taxi ride to the airport at the end of the trip, you temporarily switch to sharing via USB cable instead of Wi-Fi, because you need to finish a long email and prefer the phone to charge while doing so, rather than draining battery on two antennas at once. It's the same hotspot, but adapted to your needs at each moment of the trip.
Frequently Asked Questions
Does a hotspot drain more battery than using the phone normally?
Yes, because it keeps two antennas active simultaneously—the mobile data antenna and the Wi-Fi antenna—in addition to handling traffic from other devices. Sharing via USB cable significantly reduces this drain, as the phone charges while sharing the connection.
Can I use my phone's hotspot in another country without paying roaming charges?
Yes, if the line feeding the hotspot does not depend on your home carrier's roaming. A local data eSIM or a physical SIM from the country you are visiting will work equally well for the hotspot, without incurring roaming charges.
Does the hotspot work the same with 4G data as with 5G?
The hotspot works with either, but the speed it distributes depends on the network available to the phone at that moment and location. If there's 5G coverage, the hotspot can distribute that speed; if there's only 4G, it distributes that.
Do I need to install an app to activate the hotspot?
No. It is a native function of the operating system, both on Android and iPhone, and is activated from the Settings menu without needing to install anything additional.
Is a personal hotspot the same as a pocket router (MiFi)?
They are similar, but not the same. A hotspot uses your phone's data connection; a pocket router is a separate device, with its own SIM card and battery, dedicated solely to distributing Wi-Fi.
Is it safe to use the hotspot in an airport or crowded place?
It's usually safer than connecting to the public Wi-Fi at the location, because you control the access password. Changing the default name and password before traveling further reduces the risk.
How many GB do I need to work via hotspot on a week-long trip?
It depends on usage: checking email and browsing consumes little, while video calls or uploading large files consume much more. For light office work for a week, many travelers estimate around several gigabytes per day as a starting reference, and adjust based on their actual consumption.
What happens if I run out of data while using the hotspot?
The hotspot stops distributing internet as soon as the line feeding it runs out of data, just as it would for the phone directly. The solution depends on your carrier or provider: buying an additional package, activating another eSIM, or waiting for the plan to renew.
Conclusion and recommendation
The hotspot is a simple function once you understand what it truly does: it distributes the data you already have; it doesn't create new data. The important decision when traveling isn't "how do I activate the hotspot"—that's two taps in the Settings menu—but rather which data line you're going to put behind it, because that determines the speed, cost, and how predictable the expense will be during your trip.
If you're going to rely on the hotspot for several consecutive days, it's advisable to have a data plan with a defined package before you leave, rather than improvising with roaming or searching for a physical SIM upon arrival. For this, you can review the complete guide to traveling with eSIM, with the first steps before your next trip, and explore PuraSIM's international eSIM collection to see available destinations, with activation in approximately 1 minute, over 200 destinations, and 24/7 email and WhatsApp support in all languages if you need assistance while traveling.
