This 4G speed test measures the download speed, upload speed, ping, jitter and, where your network allows it, packet loss your phone gets on its current connection. To test 4G LTE specifically, turn WiFi off and check that your phone shows 4G or LTE before you start.
What is a 4G speed test?
A 4G speed test measures how quickly data moves between your browser and a test server over whatever connection you are using at that moment. It only tells you about your 4G LTE performance when the phone is actually on 4G: WiFi off, mobile data on, and a 4G or LTE indicator showing.
It is the same real measurement this site uses everywhere, run in your browser with Cloudflare’s open-source speed test engine against a nearby Cloudflare location. There is no separate 4G algorithm and no 4G score.
How to test 4G speed correctly
- Use a phone or tablet with mobile data.
- Turn WiFi off so the test uses your cellular connection.
- Check that the status bar or network settings show 4G or LTE. If it shows 5G, you are testing 5G instead; some phones let you choose LTE in their network settings.
- Pause large downloads, uploads, backups and app updates.
- Stand still and run the test.
- Run it again if the result looks unusual.
- When troubleshooting, repeat at another time of day or in another spot.
Repeating the test helps separate a passing dip from a pattern. It won’t make a cellular measurement perfectly stable, because radio conditions keep changing.
What this test measures
- Download speed: how quickly data reaches your phone.
- Upload speed: how quickly your phone sends data out.
- Ping: the round-trip delay to the test server while the connection is idle.
- Jitter: how much that delay varies (more on jitter).
- Ping under load: ping while downloading and uploading, under “Test details”.
- Packet loss: data that never arrives, when your network allows it to be measured (more on packet loss).
4G download speed
Download speed decides how quickly web pages load, apps and updates install, photos and videos open, and how sharp streaming video looks. There is no single standard 4G speed: LTE can range from a few Mbps at the edge of coverage to well over 100 Mbps on a strong, uncongested signal.
As a rough guide to what different results allow on one device (our guidance, not a carrier standard):
| If your LTE test shows | You can usually |
|---|---|
| Under 3 Mbps | Browse, message and stream audio. Video at low resolution. |
| 3–10 Mbps | Stream HD video on a phone (Netflix recommends 5 Mbps for 1080p) and make video calls. |
| 10–50 Mbps | Comfortable for almost anything on one device, including hotspotting a laptop. |
| Over 50 Mbps | Faster than many people need on a phone; large app downloads go quickly. |
4G upload speed
Upload speed matters when you send photos and videos, back up to the cloud, post to social media, go live or join video calls; Zoom lists about 1.2 Mbps each way for a 720p one-to-one call. On LTE, upload is usually well below download and can drop noticeably when the signal is weak. See the upload speed test for more.
4G ping and latency
Ping measures delay, not speed. It decides how responsive games, voice and video calls and interactive apps feel. LTE ping is usually higher and less steady than a good wired connection, so casual online games are usually fine but competitive gaming over LTE can feel inconsistent. Our ping test explains latency in more depth, and the gaming guide covers what games need.
4G vs. LTE: what the labels mean
In everyday use, “4G” and “LTE” usually refer to the same kind of network, and phones show either label. Strictly, the terms grew up separately:
- LTE (Long Term Evolution) is the 3GPP mobile standard that most 4G networks use.
- LTE-Advanced (often shown as LTE-A, 4G+ or similar) adds features such as carrier aggregation, which combines several frequency bands for more speed. In 2010 the ITU recognized LTE-Advanced as meeting its IMT-Advanced (“4G”) requirements.
- The ITU also said that the term 4G, while undefined, may also be applied to earlier LTE and other evolved 3G technologies.
So a 4G label doesn’t mean exactly the same technical thing on every network or phone, and carriers brand these differently. For a speed test, what matters is the speed and latency you actually get.
4G vs. 5G
5G is a newer generation of mobile technology that can offer more capacity and lower latency, but real-world results depend on how it is deployed. Low-band 5G often performs similar to good LTE, while mid-band and millimeter-wave 5G can be much faster where available. 4G LTE usually has wider, more mature coverage and works with almost every phone, while 5G needs a 5G phone and coverage where you are.
So 5G isn’t always faster or lower in latency than 4G, and 4G isn’t always slow. Coverage, spectrum, network load, your device, your location, routing and the carrier’s configuration all affect the result. If your phone supports 5G, compare with a 5G test in the same spot.
Why 4G speed changes
Signal quality, not just bars
The bar icon is a rough guide. Two places with the same bars can perform very differently because of interference and signal quality. Signal and speed are related but not the same: a strong signal doesn’t guarantee a particular number of Mbps, because capacity, congestion, your device, the network setup and the route to the server matter too. If your phone has a field-test or network-info screen, signal quality readings tell you more, but for most people the practical test is simple: run a speed test, move, and run it again.
Cell congestion
Everyone connected to a cell shares its capacity. LTE speeds often drop at commuting times, in the evening in residential areas, and at events. If your morning and evening results differ a lot in the same spot, congestion is a likely reason.
Location, buildings and movement
Results can differ a lot indoors and outdoors, near a window and deep inside a building, in dense city centers and in rural areas far from a tower, in crowded venues, and while moving or in a vehicle, when the phone hands over between cells. Buildings with metal frames and coated glass can block signal. Terrain matters too.
Carrier aggregation, bands and your phone
LTE phones can combine several frequency bands for more speed. Which bands you get depends on your carrier, your phone’s modem and supported bands, and the local tower. A newer phone on the same plan can be faster for this reason, and not every phone supports every carrier’s bands.
Your plan’s rules
Some plans slow data after a monthly threshold, reduce priority during busy periods, or cap video quality. A speed test measures what you get, so it reflects these limits if they apply to the test traffic.
Carrier network and routing
The test measures a path from your phone across your carrier’s network, and the transit and peering links it uses, to this site’s measurement infrastructure. Routing and congestion along that path affect the result. One test can’t prove a carrier is at fault.
Background data, hotspots and VPNs
App updates, cloud sync, photo backups, video uploads and streaming can compete with the test. Using the phone as a hotspot means every connected device shares the same 4G connection. A VPN changes the route, which can affect download, upload, latency and jitter, though not always for the worse; test with and without it to see.
Why your 4G may feel slow
Slow 4G doesn’t automatically mean a weak signal or a bad carrier. Common reasons include patchy coverage, a busy cell, poor indoor reception, background data, an older phone or one that doesn’t support your carrier’s bands, plan deprioritization, routing, a VPN, or a slow server on the other end.
How to improve 4G speed
Not every step helps every time; each one rules something out.
- Turn WiFi off when testing, so you know you’re measuring 4G.
- Move closer to a window or outside, or higher up, to check whether coverage is the limit.
- Stop heavy background data, and pause downloads and uploads.
- Toggle airplane mode on and off to make the phone search for the best cell again.
- Test at a different time of day to see whether congestion is involved.
- Compare another location to separate local coverage from general performance.
- Test with and without a VPN.
- Check for a carrier settings or system update, and whether your phone supports your carrier’s bands.
- Use WiFi calling indoors if your carrier supports it and your home WiFi is good.
- Contact your carrier if speeds stay poor in places where they used to be fine.
Troubleshooting slow 4G by pattern
These patterns may indicate where to look; they are not certain diagnoses:
- Fast outdoors, slow indoors: often points to building materials or indoor coverage.
- Fast at night, slow at busy times: could be related to cell congestion.
- Strong signal but low speed: may indicate congestion, limited capacity, plan deprioritization, the device or the route.
- Slow only in one location: often points to local coverage or surroundings.
- Good 4G speed but laggy games: could be related to latency, jitter, routing or the game server’s location.
- Big swings between repeated tests: may indicate changing network load, radio conditions, background data or route changes.
What your 4G speed result means
Read the numbers together and against what you do. Download and upload show how much you can move; ping, jitter, packet loss and ping under load show how responsive and steady the connection is. A result that is easily enough for browsing can still feel poor for uploading large videos, or for calls and games if latency, jitter or packet loss are high. The activity summary under your result compares your numbers with what common services publish.
Limitations of a browser-based 4G speed test
- Cellular conditions change constantly, so results vary with location and time.
- WiFi and cellular are different paths; the test can’t tell which one you used.
- It measures one route, to a nearby server.
- It can’t see your carrier, tower, band, network type or signal level, and signal bars aren’t the same as measured speed.
- It isn’t a carrier diagnostic tool and can’t pinpoint every tower or network problem.
- One test is a snapshot, not a verdict on your 4G service.
About this test
This website uses Cloudflare’s open-source speed test engine. It is independent and is not affiliated with Cloudflare or with any mobile carrier. Download, upload and ping are measured; jitter is calculated from the ping samples; packet loss is measured through a relay when your network allows. Network type, carrier and signal are not detected. Read our methodology, learn who runs this site, or see what data the test sends.