Short answer: watching live TV on a phone is easy — the costs are mobile data and battery, not setup. An hour of HD streaming uses roughly 1.5–3 GB, and 4K up to 7 GB, so on a capped plan a few matches can use a month's allowance. The fixes are simple: lower the quality in the app when you're on mobile data, download on Wi-Fi before you travel, and cast to the TV at home instead of mirroring your screen. For the source, most people need nothing more than their TV provider's or broadcasters' own apps, which are free on both iPhone and Android.
Which app to use
Your TV service's own app. YouTube TV, Sling, NOW, Sky Go, BBC iPlayer, Molotov, Zattoo and their equivalents all have phone apps included with the subscription. This is the simplest option and usually the best one.
Free apps. Pluto TV, The Roku Channel, Tubi and broadcasters' own apps carry free live channels and on-demand programmes. What's free on Roku, and on phones too.
A playlist player. If your provider gives you an M3U playlist or Xtream Codes login, you need a player app. On iPhone, the options are covered in our Apple TV guide — most have iPhone versions. On Android, many TV players run on phones too, though some are designed for remotes. VLC works everywhere and is free. Using VLC for IPTV.
Check the developer before you install a playlist player and enter your login — lookalike apps are common. How to spot the real one.
Data usage is what surprises people
| Quality | Roughly per hour |
|---|---|
| Low / SD | 0.5–0.8 GB |
| HD 720p | 1–1.5 GB |
| Full HD 1080p | 2–3 GB |
| 4K | 5–7 GB |
A football match in Full HD is 4–6 GB. Two a week comes to around 40 GB a month.
Nearly every app has a setting for this — look for "Video quality", "Data saver" or "Streaming quality". Set it to low or medium on mobile data and high on Wi-Fi. On a phone screen, the difference between 720p and 1080p is hard to see.
Also check autoplay. Apps that start playing trailers or the next episode in the background are a common reason data disappears without explanation.
Download before you travel
Most paid services let you download on-demand programmes for offline viewing. Download at home over Wi-Fi and watch on the train without touching your mobile data.
Two limits: live channels can never be downloaded, and downloads usually expire — often after 30 days, or 48 hours after you start watching.
Battery
Video is one of the most power-hungry things a phone does: screen, decoding and network all at once.
What helps most: lower the screen brightness, use Wi-Fi rather than mobile data where you can, and download rather than stream. Streaming on a weak mobile signal is particularly draining, because the phone raises its transmit power when reception is poor.
At home, cast instead
When you're home, the phone makes a better remote than a screen.
Look for the cast button inside the app. It sends the stream straight to your TV or streaming stick, which fetches the video itself — full quality, and your phone is free again. Screen mirroring is the worse option: the phone re-encodes its whole screen and sends it over Wi-Fi, costing quality and battery. Casting versus mirroring.
Watching abroad
Within the EU, portability rules let you use subscriptions from your home country while travelling, at no extra cost. Outside the EU, and for many non-EU services, apps usually block playback when they detect you're in another country, because rights are licensed by territory.
Why phones get sport last
Live sport on a phone is usually 30–60 seconds behind TV broadcast, and notifications on the same phone will spoil goals before you see them. Turn off score alerts while you watch. More on delay and spoilers.
About the "every channel for a few pounds" apps
App stores and websites are full of apps promising thousands of channels and every sport for a tiny fee. The price doesn't add up — sports and premium channel rights cost far more than that — and these apps are a common way of distributing malware to phones, which hold far more personal data than a TV box. How to judge any IPTV service.
Quick answers
How much data does an hour of TV use? Roughly 1.5–3 GB in HD, up to 7 GB in 4K.
Can I download live TV? No. Only on-demand programmes.
Why does my battery drain so fast? Video uses screen, decoding and network at once. Weak signal makes it worse.
Does my subscription work abroad? Within the EU, usually yes. Elsewhere, usually not.
What's the cheapest option? Free broadcaster apps and ad-supported services like Pluto TV.
Should I mirror my phone to the TV? Cast instead if the app supports it — better quality, and your phone stays free.