What Is a Mobile Hotspot and How Does Tethering Work?

A mobile hotspot lets you share your phone's internet connection with other devices such as laptops, tablets and other phones. It is one of the most useful features on a modern smartphone — turning your mobile data into a portable WiFi network wherever you go. For businesses, it can be a lifeline when office broadband drops or staff are working remotely.

What Is a Mobile Hotspot?

A mobile hotspot is when your phone creates a small WiFi network using its mobile data connection. Other devices connect to this WiFi network just as they would connect to a home router. Your phone acts as the bridge between the mobile network and your other devices.

Every modern smartphone — iPhone and Android — has hotspot functionality built in. You do not need to install any apps or buy additional hardware. Simply enable the feature in your phone's settings and nearby devices can connect using the password you set.

What Is Tethering?

Tethering is the broader term for sharing your phone's internet connection with another device. There are three ways to tether:

Method	How It Works	Best For
WiFi Hotspot	Your phone broadcasts a WiFi network. Other devices connect wirelessly.	Connecting multiple devices at once. Most common and convenient method.
USB Tethering	Connect your phone to a laptop via USB cable. The laptop uses the phone's data connection.	Single device, faster speeds, charges your phone at the same time.
Bluetooth Tethering	Pair your phone with another device via Bluetooth.	Lower power consumption, but slower speeds. Rarely used in practice.

Most people use the terms hotspot and tethering interchangeably, and WiFi hotspot is by far the most popular method.

How to Set Up a Mobile Hotspot

Setting up a hotspot takes less than a minute on any smartphone. Below are step-by-step instructions for both iPhone and Android.

How to Set Up a Hotspot on iPhone

1. Open Settings and tap Personal Hotspot (or go to Settings > Mobile Data > Personal Hotspot).
2. Toggle Allow Others to Join to on.
3. Note the WiFi Password shown on screen — you can tap it to change it.
4. On the device you want to connect, open WiFi settings and look for your iPhone's name.
5. Select it and enter the password. You are now connected.

Your iPhone status bar turns blue (or shows a green pill on newer models) when a device is connected to your hotspot. For a more detailed walkthrough, see our full guide: How to Set Up a Hotspot on iPhone.

How to Set Up a Hotspot on Android

1. Open Settings and go to Network & internet (or Connections on Samsung devices).
2. Tap Hotspot & tethering (or Mobile Hotspot and Tethering).
3. Tap WiFi hotspot and toggle it on.
4. Set a network name and password if you have not already.
5. On the device you want to connect, open WiFi settings and select your phone's hotspot name.
6. Enter the password. You are now connected.

Menu names vary slightly between manufacturers (Samsung, Google Pixel, OnePlus, etc.), but the process is essentially the same. See our full guide: How to Set Up a Hotspot on Android.

When Is a Hotspot Useful?

• No WiFi available: working from a café, hotel or location without reliable broadband.
• Backup internet: if your home or office broadband goes down, your phone can keep you connected.
• Travelling: stay connected on trains, in cars (as a passenger) or at events.
• Working remotely: use your phone's data to join video calls and access work tools from anywhere.
• Connecting tablets and laptops: WiFi-only devices like iPads can get online through your phone.
• Client meetings: present from your laptop at a client site without needing their guest WiFi.

How Much Data Does a Hotspot Use?

Tethering to a laptop or computer uses significantly more data than browsing on your phone. This is because websites serve full desktop versions, video calls run at higher quality, and your laptop's operating system downloads updates in the background.

Here is a breakdown of typical data consumption when tethering:

Activity	Data per Hour	8-Hour Workday
Web browsing & email	100–300 MB	0.8–2.4 GB
Email and messaging only	50–100 MB	0.4–0.8 GB
Video calls (Zoom, Teams)	1–2 GB	4–8 GB (for 4 hrs of calls)
Streaming music (Spotify)	75–150 MB	0.6–1.2 GB
Streaming video (HD)	3–5 GB	24–40 GB
Cloud file sync (OneDrive, Google Drive)	200–500 MB	Varies greatly
Software/OS updates	500 MB – several GB	Unpredictable — disable auto-updates

Tip: A typical remote worker using email, web browsing and a couple of hours of video calls will use roughly 3–6 GB per day. Over a month of occasional hotspot use, 20–50 GB is realistic. Factor this into your plan choice.

If you have a limited data plan, disable automatic updates on your laptop, pause cloud sync, and close unnecessary background apps before tethering. For more on choosing the right data allowance, see our guide to unlimited data plans.

Does Your Plan Allow Tethering?

Most UK mobile plans include tethering at no extra cost — the data you use through your hotspot comes from your standard data allowance. However, there are some things to check:

• Unlimited data plans: some networks apply a tethering cap. For example, certain Three unlimited plans cap hotspot data at a set amount per month, even though on-device data is unlimited.
• Fair usage policies: networks may throttle speeds if you tether excessively.
• PAYG and low-cost plans: tethering is usually included, but check the terms as some budget MVNOs restrict it.

Check your plan details in your network's app or website, or call customer services to confirm.

Best UK Plans for Hotspot and Tethering (2026)

If you rely on your hotspot regularly — especially for business — choosing the right plan matters. Here is how the major UK networks handle tethering in 2026:

Network	Tethering Policy	Best For
EE	Full tethering included on all plans. Unlimited plans allow unlimited hotspot use.	Businesses needing reliable, high-speed tethering with the UK's largest 5G network.
Vodafone	Tethering included. Unlimited plans include unlimited hotspot data.	Companies with European travel needs (Vodafone roaming is strong).
O2	Tethering included on all plans. No separate hotspot cap on unlimited plans.	Businesses already on O2 infrastructure. See our O2 APN settings guide if you have connection issues.
Three	Tethering included but some unlimited plans cap hotspot data (check your specific plan).	Budget-conscious businesses — Three often has the lowest prices for large data.

Network policies change regularly, so always confirm current terms before signing up. For a full comparison, read our best mobile networks in the UK for 2026 guide.

Hotspot vs WiFi: What's the Difference?

People sometimes confuse mobile hotspots with regular WiFi. Here is the key difference:

	Mobile Hotspot	WiFi (Broadband)
Internet source	Mobile network (4G/5G)	Fixed-line broadband (fibre, cable, ADSL)
Portability	Goes wherever your phone goes	Fixed to a location
Speed	Typically 20–100 Mbps (5G can exceed 300 Mbps)	Typically 30–900 Mbps depending on package
Data limits	Usually capped by your mobile plan	Usually unlimited
Latency	Higher (20–50ms on 5G, 30–80ms on 4G)	Lower (5–20ms on fibre)
Best for	On-the-go connectivity, backup internet	Primary internet for home/office

A mobile hotspot is not a replacement for broadband in most cases, but it is an excellent backup and essential for mobile workers. With 5G expanding across the UK, hotspot speeds are now fast enough for most business tasks including video conferencing.

Business Hotspot Tips

If your team relies on mobile hotspots for work, these tips will help you get the most from your setup:

• Choose plans with generous or unlimited tethering. A plan that caps hotspot data at 10 GB will not last a remote worker more than a few days. Look for plans with at least 50 GB or unlimited tethering.
• Set strong passwords. An open hotspot is a security risk. Use WPA3 if your phone supports it, and change the default password to something unique.
• Use a VPN. For sensitive business data, always connect through your company VPN when tethering. This encrypts traffic and protects against interception.
• Carry a portable charger. Running a hotspot drains your battery fast — expect 3–5 hours of continuous use. A 10,000+ mAh power bank keeps you going all day.
• Limit connected devices. Each additional device shares the same bandwidth. For video calls, disconnect other devices to maintain call quality.
• Consider a dedicated hotspot device. For teams that tether daily, a dedicated MiFi device or 5G mobile router gives better battery life, stronger signal and does not tie up anyone's phone.
• Monitor data usage. Set data alerts on each phone to avoid bill shock. Most networks let you set warnings at 50%, 80% and 100% of your allowance.

Hotspot Security: Staying Safe

When you enable a mobile hotspot, you are creating a wireless network that others could potentially connect to. Follow these security practices:

• Always use a strong, unique password — avoid simple passwords like "12345678".
• Use WPA3 or WPA2 encryption (this is the default on modern phones).
• Turn off your hotspot when you are not using it.
• Check your connected devices list regularly — if you see an unknown device, change your password.
• Avoid naming your hotspot with personal or business information (e.g. do not call it "Acme Corp iPhone").

Troubleshooting Common Hotspot Issues

If your hotspot is not working as expected, try these fixes:

• Devices cannot find your hotspot: toggle the hotspot off and on again. Restart your phone if the issue persists.
• Connected but no internet: check that mobile data is enabled and you have signal. Try toggling Airplane Mode on and off.
• Slow speeds: move to an area with better signal. Disconnect devices you are not using. Switch from 2.4 GHz to 5 GHz band if your phone supports it (5 GHz is faster but shorter range).
• Hotspot keeps disconnecting: disable battery saver mode, which can turn off the hotspot to save power. Keep your phone plugged in if possible.
• Network not allowing tethering: some plans require correct APN settings. Check our APN settings guides for your network.

Frequently Asked Questions

Is a mobile hotspot the same as tethering?

They are closely related. A mobile hotspot specifically means your phone broadcasts a WiFi network for other devices. Tethering is the broader term that also includes sharing your connection via USB cable or Bluetooth. In everyday use, most people use the terms interchangeably.

Does using a hotspot cost extra?

On most UK plans, no. Hotspot data comes from your standard data allowance at no additional charge. However, some unlimited plans cap the amount of data you can use via hotspot, so check your plan terms.

How many devices can connect to my hotspot?

Most smartphones support 5–10 simultaneous connections. iPhones typically allow up to 5 devices, while many Android phones support up to 10. The more devices connected, the slower the speed for each.

Does hotspot drain my battery?

Yes, significantly. Running a hotspot uses both the cellular radio and WiFi transmitter simultaneously. Expect your battery to drain 2–3 times faster than normal. Use USB tethering when possible, as it charges your phone at the same time.

Can I use my hotspot abroad?

It depends on your plan's roaming terms. Many UK plans include roaming in Europe, but tethering abroad uses your roaming data allowance, which is often capped. Check with your network before relying on your hotspot overseas, as charges can add up quickly.

Is 5G better for hotspot use?

Yes. 5G offers faster speeds (often 100–300+ Mbps) and lower latency than 4G, making it much better for tethering — especially for video calls and large file transfers. If you are in a 5G area, your hotspot experience will be significantly better.