What is a mobile hotspot and how does it work?
A mobile hotspot is your phone sharing its mobile data connection as a WiFi network, so a laptop, tablet or games console can get online through it. Your phone is quietly a router that also makes calls. Switch it on and other devices connect to it like any other WiFi network.
You will also see it called tethering or personal hotspot. On an iPhone it lives under Personal Hotspot in Settings. On most Android phones you will find it under Network or Connections, then Hotspot and tethering. Set a proper password, because an open hotspot is an invitation.
It is a lifesaver when the broadband drops, the train WiFi gives up or you are working from a car park. It is also very good at eating a data allowance without telling you. That is where most of the trouble starts. A little planning goes a long way: know your allowance, know your network’s limits and switch the mobile hotspot off when you are done.
Does using a mobile hotspot cost extra?
On most UK pay monthly and SIM only plans, sharing your data as a mobile hotspot does not carry a separate charge, but the rules differ by network and plan. Some plans limit how much data you can share, even when the main allowance is unlimited. Others set fair use limits on how many devices you connect or how much data you push through.
Those terms change, and they can be different on pay as you go bundles. So do not rely on a comparison blog, including this one, for the final word. Check your own network’s current terms for tethering or personal hotspot before you plan to use your phone as your main connection.
Roaming is the other trap. A hotspot abroad uses your roaming allowance, and some plans exclude it or cap it. Our guide to EU roaming charges explains what to look for before you fly.
How much data does a mobile hotspot use?
More than your phone does on its own, because laptops and consoles are not shy. They update in the background, sync files and stream at higher quality. Here is how the big data users compare when you share them through a mobile hotspot:
- Browsing, email and messaging: fairly light, and fine for a few hours of work.
- Video calls: think in hundreds of megabytes to a gigabyte or more an hour, depending on quality.
- Streaming HD video: usually a few gigabytes an hour, and 4K uses considerably more.
- Game and software updates: often several gigabytes in one go, sometimes tens of gigabytes.
There is an easy way to get your own number. Note your data counter before an hour of typical mobile hotspot use, then check it again afterwards. That figure is worth more than any generic estimate, and it takes two minutes.
The apps and services you use will publish their own figures too. The takeaway is simple. A small data plan and a hotspot do not mix, and the mobile hotspot will use up your allowance long before the month ends. Our guide to how much mobile data you really need helps you size a plan.
When is a mobile hotspot a bad idea?
A mobile hotspot is a good backup and a poor permanent replacement for home broadband. Signal strength varies room by room, speeds can dip at busy times and fair use limits may apply. If you keep finding yourself living on your phone’s connection, it may be time to look at a proper home connection.
Some households do use 5G home broadband instead of a fixed line, which is a different product from tethering. It works from a dedicated router and plan, and our guide to 5G home broadband versus fibre covers the trade offs.
A few other watch outs are worth knowing:
- Battery: sharing a connection drains your phone quickly, so keep it plugged in if you can.
- Security: use a strong password and switch the hotspot off when you are finished.
- Devices that quietly sync: pause cloud backups and automatic updates while you are connected.
Three quick checks before you rely on a mobile hotspot
- Read your plan’s terms for tethering or personal hotspot limits, and note your data allowance.
- Turn off automatic updates and cloud backups on the laptop or tablet you connect.
- Keep an eye on your data usage as you go, using the counter in your phone settings or your network’s app.
Most of us choose a data plan once and never think about it again. Doing nothing is how you end up rationing a hotspot at the end of the month. If your data keeps running short, a comparison takes a few minutes and shows what bigger allowances cost.
Key takeaways
- A mobile hotspot shares your phone’s data connection as WiFi for other devices.
- Many UK plans allow it at no separate charge, but caps and fair use limits vary, so check yours.
- Laptops and consoles use far more data than phones, so a small plan runs out fast.
- Roaming and battery drain are the two traps most people miss.
- It is a good backup, not a great replacement for home broadband.
Frequently asked questions about mobile hotspot use
- Is a mobile hotspot the same as tethering?
- Yes. Tethering, personal hotspot and mobile hotspot all mean sharing your phone’s mobile data connection with another device, usually over WiFi.
- Can I use my phone as a mobile hotspot on an unlimited plan?
- Usually yes, but some unlimited plans cap the data you can share or set fair use limits. Check your network’s current terms for tethering.
- Does a mobile hotspot use a lot of battery?
- Yes. Sharing a connection keeps the modem and WiFi working hard, so your battery drains faster. Plugging the phone in while you use it helps.
- Will a mobile hotspot work abroad?
- It can, but it uses your roaming allowance and some plans exclude or cap it. Check your plan’s roaming terms before you travel.
