Read signal information in context
Use available signal and connection details alongside carrier, technology and Cell ID information. A number becomes more useful when you can compare where and when it was measured.
Signal diagnostics
A signal strength app for iPhone that adds context.
Bars are a shortcut. Cell Tower Locator brings signal details, nearby tower data and a speed test into one clear workflow.
Download on theApp StoreFree · iOS 17 or later
-78 dBmCompare readings in different rooms, locations and times instead of relying on one bar icon.
Compare 5G and LTE
Your iPhone may switch between network generations as coverage, capacity and radio quality change. The app helps you investigate the sites and technology around the connection.
Pair signal with a speed test
A strong radio reading does not guarantee fast data. Test download, upload and ping to separate signal conditions from congestion or network capacity.
Built for mobile questions
Map, understand, measure.
Cell Tower Locator keeps tower context and real-world performance together, so you can investigate a weak or confusing connection without switching between several tools.
Use the app as a diagnostic tool: observe, move, measure and compare. No app can override carrier coverage or increase the physical power of an iPhone antenna.
Questions about the app
Make sense of your mobile network.
What is a good iPhone signal strength reading?
A value closer to zero is generally stronger for received power, but RSRQ, SINR, congestion and the network band also affect the result.
Can an app show cell signal strength on iPhone?
Cell Tower Locator shows available connection context and tower information supported by the device and network, then pairs it with a speed test.
Why is my iPhone slow with full bars?
Congestion, interference, limited spectrum, backhaul, VPN routing or a carrier plan limit can slow data even when received power looks strong.
See what is around your iPhone.
Find tower context and test your connection in one focused utility.