Tech for Beginners Part 13: Mobile Hotspot, Bluetooth and Public Wi-Fi Safety

Your phone can do much more than connect to the internet for itself. It can share its mobile data with a laptop or another phone as a hotspot, connect wirelessly to earphones, speakers and car stereos using Bluetooth, and join free Wi-Fi at railway stations, airports and cafes. Each of these is useful, and each needs a little care. This is Part 13 of our Tech for Beginners series. Today we will learn how to set up a hotspot safely, pair Bluetooth devices, and protect yourself on public Wi-Fi.

Part 11 covered Wi-Fi basics and Part 12 covered 5G. The Bluetooth and hotspot tiles live in Quick Settings, which we explored in Part 4. For broader safety, keep our guide on how to tell if your phone is hacked in mind.

Part A: Mobile hotspot

A mobile hotspot turns your phone into a small Wi-Fi router. Other devices, such as a laptop, a tablet or a family member's phone, connect to it and use your mobile data.

Before you start

• Hotspot use counts against your data plan. A laptop can use data much faster than a phone because of updates and larger web pages.
• Some plans limit or do not allow hotspot use, or count it differently. Check your plan's terms in your operator's app.
• Hotspot uses extra battery. Keep a charger handy for long sessions.

Turn on hotspot on Android

1. Open Settings and tap Network & internet (or Connections on Samsung).
2. Tap Hotspot & tethering (or Mobile Hotspot and Tethering).
3. Tap Wi-Fi hotspot (or Mobile Hotspot).
4. Check the Hotspot name and Hotspot password. Change the password to something long and not easy to guess.
5. Make sure security is set to WPA2 or WPA3, never "None" or "Open".
6. Switch the hotspot on.

You can also turn the hotspot on and off from the Quick Settings tile once it is set up.

Turn on hotspot on iPhone

1. Open Settings and tap Personal Hotspot (if you do not see it, look under Mobile Service or Mobile Data).
2. Turn on Allow Others to Join.
3. Tap Wi-Fi Password to see or change it.

Devices signed in to the same Apple Account or in Family Sharing may be able to join without typing the password.

Connect another device

1. On the laptop or other phone, open Wi-Fi settings.
2. Choose your phone's hotspot name.
3. Enter the hotspot password and connect.

Hotspot safety and data tips

• Do not share your hotspot password with strangers.
• Check the list of connected devices on your phone's hotspot screen, and remove any you do not recognise.
• Turn the hotspot off when you finish. Many phones offer an option to turn it off automatically when no device is connected.
• On a laptop, pause big updates and cloud backups while using a hotspot. On Windows, you can mark the connection as a metered connection in its network settings to reduce background downloads.

Other ways to share: USB and Bluetooth tethering

Besides Wi-Fi hotspot, Android phones offer two other sharing options on the same Hotspot & tethering screen:

• USB tethering: connect the phone to a laptop with a USB cable and switch on USB tethering. It is often more stable than Wi-Fi and charges the phone at the same time.
• Bluetooth tethering: shares internet over Bluetooth. It is slower, but uses less battery, and is fine for light use like email.

On iPhone, connecting by USB cable to a computer with Personal Hotspot on can also share the connection.

Part B: Bluetooth earphones, speakers and more

Bluetooth is a short-range wireless technology, usually reaching about ten metres, though walls and other obstacles reduce it. It connects your phone to earphones and earbuds, neckbands, speakers, smartwatches, fitness bands, car stereos and some printers. Connecting for the first time is called pairing. After that, devices usually reconnect automatically.

Pair Bluetooth earphones or a speaker

1. Put the device in pairing mode. This differs by product. For many earbuds, open the case lid or press and hold the button on the case. For speakers and neckbands, press and hold the power or Bluetooth button until a light blinks or you hear "pairing". Check the product's manual.
2. On Android: open Settings, tap Connected devices (or Connections, then Bluetooth), and tap Pair new device. Many earbuds also show a pop-up on Android phones when you open the case nearby (Fast Pair).
3. On iPhone: open Settings, tap Bluetooth, make sure it is on, and wait for the device to appear under Other Devices.
4. Tap the device's name.
5. If asked, confirm a matching code or tap Pair. Some older devices ask for a PIN, often "0000" or "1234"; check the manual.
6. Play a song to test the sound.

Common Bluetooth problems

• Device not showing: make sure it is in pairing mode and charged, and that it is not already connected to another phone nearby. Turn Bluetooth off and on.
• Sound coming from the wrong place: while playing, tap the output switcher in the media controls (in Quick Settings or Control Centre) and choose the right device.
• Keeps disconnecting: keep the phone closer, charge the device, or forget the device and pair it again. On Android, tap the gear next to the device and choose Forget or Unpair. On iPhone, tap the blue i and choose Forget This Device.

Connecting to your car

Many cars and car stereos support Bluetooth for calls and music. Usually you open the stereo's Bluetooth or phone menu, choose "Add device" or "Pair", then pick the car's name on your phone and confirm the code on both screens. Allow contacts access only if you want the car to show caller names. Do it while parked, never while driving.

Bluetooth safety tips

• Accept pairing requests only from devices you are trying to connect. If an unexpected request pops up, especially in a crowded place, decline it.
• Do not accept files sent over Bluetooth or nearby sharing from strangers.
• Remove old devices you no longer use from your paired list.
• Keep your phone updated, since updates fix security problems in Bluetooth too.
• For Android's Quick Share and iPhone's AirDrop, set receiving to "Contacts only" or turn receiving off when you are in public places.

Part C: Public Wi-Fi safety

Free Wi-Fi is available at many railway stations, airports, malls, hotels and cafes. It is convenient, but you do not control who runs the network or who else is on it. Risks include:

• Fake hotspots: a criminal can set up a network with an official-sounding name, such as "Station_Free_WiFi", to trick people into connecting.
• Snooping: on poorly secured networks, others may try to watch traffic or attack devices on the same network.
• Fake login pages: some networks show a sign-in page. A fake page might ask for unnecessary details.

Precautions on public Wi-Fi

CERT-In, India's national cyber security agency, has published advice on public Wi-Fi. Combining that guidance with common sense, follow these steps:

1. Confirm the network name with staff or official signboards before connecting.
2. Avoid banking, UPI, shopping and entering passwords on public Wi-Fi. Switch to your own mobile data for these tasks; it is generally safer.
3. Look for HTTPS (a padlock in the address bar) on any website, and use official apps rather than links.
4. Share as little as possible on sign-in pages. Usually a mobile number and an OTP from the official provider are enough. Never give your bank OTP, card details or UPI PIN to get Wi-Fi access.
5. Use a trusted VPN if you must do sensitive work on public Wi-Fi. Choose a reputable provider and avoid unknown free VPN apps.
6. Turn off file sharing and set nearby sharing to contacts only.
7. Disconnect and forget the network after use, and turn off auto-join for public networks so your phone does not connect by itself next time.
8. Keep your phone and apps updated.

A safer alternative

If you are with a trusted family member, using their hotspot is usually safer than an open public network. And for most everyday tasks, your own mobile data is the simplest safe choice.

Frequently asked questions

Does a hotspot use more data than using the phone alone?

The data counts the same, but laptops and tablets usually consume more data than phones because of larger pages, background updates and higher video quality.

Can someone hack my phone through Bluetooth?

Attacks are uncommon but possible, especially on outdated phones. Keep your phone updated, decline unknown pairing requests, and turn Bluetooth off if you do not use it.

Is free railway station Wi-Fi safe for UPI?

It is better to use your own mobile data for UPI and banking. If you have lost money to fraud, call the national cyber crime helpline 1930 or report at cybercrime.gov.in as soon as possible. Our guide on protecting yourself from UPI and online payment frauds has more tips.

Why does my phone connect to Wi-Fi networks automatically?

Phones remember networks you have joined before. Forget networks you no longer use and turn off auto-join for public ones.

What is next

Try this today: change your hotspot password to a strong one, check your list of paired Bluetooth devices and remove old ones, and turn off auto-join for any public network your phone remembers. In the next part of Tech for Beginners, we will learn how to choose a home broadband connection: fibre, AirFiber and other options, what Mbps means, and questions to ask before you sign up.