CSV Preview, Cell Zones & Stability
By the CellInfo Dev Team | Published: 6th July 2026
📋 NEW: CSV Preview — Table View & Map
The Import CSV tab has always let you load and process your files — now it lets you actually explore them before you commit to anything.
Tap View after selecting a file in the Import CSV tab and you get a full three-tab preview:
- Summary: A rich at-a-glance overview of your file:
- Row count, column count, unique cells seen, file size, and how many rows have mapped coordinates
- Whether the file contains Mast Names data
- Time span — first and last recorded timestamps, plus the total session duration (e.g. 1h 20m)
- Signal range — best, worst, and average signal in dBm across the entire file
- Carriers — every operator present in the file (e.g. 3, O2 – UK, O2 Wi-Fi Calling)
- Network types — all standards recorded (4G LTE, 4G LTE-A, 5G NSA, 5G SA, etc.)
- Top cells — the five most-seen Cell IDs with their reading counts
- Preview rows — confirms how many rows were loaded, with a note for large files that are read in batches
- Table: All your recorded measurements in a scrollable horizontal table. Swipe left and right to see all 27 columns including carrier, mast name, Cell ID, PCI, MCC/MNC, band, signal strength, and location coordinates. Shows up to 200 preview rows so it stays fast even on large files.
- Map: Shows the location of any row you select from the table.
Double-tap any row in the Table view to jump straight to the Map tab. A pin drops at the exact coordinates where that measurement was recorded, with a full popup showing:
- NCI and gNB:CID breakdown
- PCI, MCC:MNC, LAC/TAC
- Band and signal strength in dBm
- Date, time, and precise coordinates
The Table view also includes a live search bar — start typing and rows filter instantly so you can find a specific carrier, cell ID, or band without scrolling through hundreds of entries.
📡 NEW: Cell Zones in Mast Names
When a mobile tower has multiple sectors pointing in different directions, each one has its own Cell ID. Mast Names now tracks each individual sector — called a Zone — separately.
- Sectors (Zones) Panel: Open any saved tower and scroll down to the new Sectors panel. Each Zone shows the Cell ID, PCI, band, strongest signal reading, the location where that signal was measured, and when the sector was last seen.
- Per-Zone Signal History: As you move around a tower, CellInfo records which sector you are on and maintains separate signal history for each one. Best signal, best location, and last seen are all tracked independently per sector.
- Live Tracking: Zone data is captured automatically during normal signal logging — no extra steps required.
📤 IMPROVED: Export & Import Includes Zone Data
- JSON Export: Each tower’s export now includes a
cellsarray with the full Zone data — Cell ID, PCI, band, signal readings, and locations. - Smart Import Merge: Importing a backup merges Zone data intelligently — strongest signals are preserved, last-seen timestamps are respected, and duplicate entries are never created.
- Legacy Compatibility: Exports from older versions are handled gracefully. If a backup predates Zone tracking, the import reconstructs a single Zone entry from the flat tower data where possible.
🚀 FIXED: Startup Stability
- Startup Freeze on Pixel 6 Pro and Android 12 Devices: Resolved a rare issue where the app could freeze or show an ANR dialog immediately on launch. SIM subscription checks were running on the main thread at startup — these have been moved to a background thread so the app always opens cleanly.
💡 NEW: Getting Started Tips
New users now see a short guided walkthrough the first time the app loads — five tips that appear one at a time, introducing the core features without getting in the way.
- Top Menu Scrolls: Shows the tab bar scrolls left and right, with a live animated hint so you can see it before dismissing.
- Core Tabs: Introduces SIM Info, Network, and Cell Info and explains what each one is for.
- Towers Map and Search: Explains how the tower lookup works and sets expectations around public database coverage.
- Logs, CSV Import, and Signal Map: Covers logging, importing CSV files, and the Signal Map tab for reviewing captured data.
- Dash View: Introduces the large, quick-glance view for coverage testing and travel.
The tips only appear once and can be turned off permanently in Settings → Startup Tips.
The more you move, the more CellInfo learns — now right down to which sector of the tower you were on. And for anyone new, the guided tips are there to get you started.The more you move, the more CellInfo learns — now right down to which sector of the tower you were on.