The Engineering Behind CellInfo

Developed by TheBFGuk — Bridging the gap between raw cellular data and user-friendly diagnostics.

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.

Dev Note: The “Root” Challenge

“As a sole developer, my goal was to provide ‘Root-level’ visibility without requiring the user to actually root their device. By interpreting the subband reports and modulation tables (256QAM/1024QAM), CellInfo provides transparency into carrier resource allocation.”

— TheBFGuk

System Architecture

Component	Metric Captured	Purpose
Physical Layer	PCI, EARFCN, Timing Advance	Tower identification and distance estimation.
Transport Layer	CQI, MCS, Modulation Index	Determining data throughput efficiency (QAM).
Network Layer	MCC, MNC, TAC, Slicing ID	Carrier verification and 5G SA Slicing detection.

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CellInfo 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.