Built to Make Mobile Networks Easier to Understand
CellInfo is an independently developed Android mobile network analysis app designed to help users understand what is really happening between their phone and the cellular network.
Mobile phones normally reduce a complicated radio connection to a few signal bars. CellInfo goes much deeper, exposing the network and radio information that Android makes available from the device’s cellular modem.
The aim is simple: turn complex LTE and 5G information into useful, understandable data.
CellInfo can be used by everyday mobile users who want to investigate poor coverage, as well as network enthusiasts and technical users who want detailed cellular information for testing, troubleshooting and analysis.
Why CellInfo Was Created
CellInfo grew from a genuine interest in mobile networks, radio technology and understanding how phones interact with cellular infrastructure.
Rather than simply displaying whether a phone has 4G or 5G coverage, CellInfo was developed to expose much more of the information available from Android.
This includes network identity, serving-cell information, neighbouring cells, frequency bands, signal measurements and location data.
As the project has developed, CellInfo has expanded beyond basic signal information into tools for:
- LTE and 5G NR network analysis
- Signal strength and signal quality measurements
- MCC, MNC, TAC, LAC and Cell ID identification
- LTE eNB and 5G NR cell information
- Physical Cell ID (PCI)
- Frequency and mobile-band identification
- RSRP, RSRQ, RSSI and SINR measurements
- Timing Advance
- Serving and neighbouring-cell analysis
- Carrier Aggregation information
- GPS-based signal mapping
- Drive-test logging
- Network diagnostics
- Latency, jitter and packet-loss testing
- Download and upload performance testing
The exact information available depends on the Android device, modem chipset, Android version and what information the mobile network exposes to the handset.
Developed Through Real-World Testing
CellInfo is not just a collection of cellular definitions.
Development and testing involve real Android devices and real LTE and 5G network connections, with features refined around the information devices actually report.
Mobile networking is complicated, and Android manufacturers do not all expose cellular information in exactly the same way. A feature that works on one handset or modem may provide different information on another.
CellInfo therefore continues to evolve as Android, modem hardware and mobile networks change.
That real-world variation is also why CellInfo reports the information available from the device rather than attempting to manufacture or estimate cellular measurements that Android has not supplied.
More Than an App
This website is also being developed as a technical resource for people wanting to learn more about mobile networks.
The CellInfo guides and glossary explain subjects including:
- LTE and 5G signal measurements
- RSRP, RSRQ and SINR
- LTE eNB and Cell IDs
- 5G gNB and NR Cell Identity
- Mobile Country Codes and Mobile Network Codes
- LTE and 5G frequency bands
- Carrier Aggregation
- Network diagnostics
- Cellular mapping and network analysis
The goal is to explain these subjects in practical terms and show how the measurements relate to information users can see inside CellInfo.
Independent Development
CellInfo is an independent project and is not operated by, endorsed by or affiliated with any mobile network operator.
Network names, trademarks and technologies referenced by CellInfo remain the property of their respective owners.
The app continues to be developed and improved using feedback, testing and changes within Android and mobile-network technology.
The Data Engine
CellInfo leverages the Android Telephony API to extract real-time metrics directly from the device’s baseband modem. Unlike consumer “speed test” apps, CellInfo captures the low-level handshake between your device and the gNB (5G Base Station) or eNB (4G Tower).
- ✅ Raw Signal Extraction: RSRP, RSRQ, and RSSNR metrics.
- ✅ Frequency Analysis: ARFCN and Band detection (n28, n78, etc.).
- ✅ Advanced Metrics: 5G Timing Advance and CQI Table Indexing.
System Architecture
Ready to Analyze Your Network?
Download CellInfo today and see the engineering data your phone usually hides.
Get it on Google PlayCellInfo is a FastTech / theBFGuk project.
🛠️ Engineering Update: 700MHz (Band 28/n28) Precision
A common issue in cellular diagnostics is the misidentification of the 700MHz frequency. Many tools incorrectly label 5G Standalone (SA) signals as legacy LTE Band 28.
- The Logic Fix: I have implemented custom carrier-aggregation mapping to ensure n28 is correctly identified when operating on a 5G core.
- UK Network Support: This is specifically optimized for the ongoing 5G SA rollout across UK networks (O2, Vodafone), ensuring engineers get accurate NR-ARFCN data rather than ghost LTE metrics.