Log files
Log files is the destination that saves survey records on the phone itself. It writes plain CSV files, one per record type, that open in any spreadsheet or script. It needs no account, no server and no internet connection.
Log files is the only destination that takes every record type, including Call records and an NS Scout’s Raw frames, which it saves as pcapng files next to the CSV files. A survey that does not send to Log files writes no files at all.
Turn it on
Section titled “Turn it on”- On the Survey tab, choose what to record under What should it survey?
- Under Where should the data go?, turn on Log files (its row reads “CSV on this phone”).
- Tap Start survey.
You can send the same survey to other destinations at the same time. Each destination gets every selected record type it can take; see The Survey tab for how that works.
The Log files page
Section titled “The Log files page”Tap the Log files row on the Survey tab, or go to More > Log files.
- Status: while a survey is saving here, the top panel shows the same status as the Survey tab row, for example Saving.
- Location: where the files are,
Download/NetworkSurveyData/csv, and how much free space the phone has. Tap it to open the folder in a file manager. - Start a new file every: how big a file gets before a new one starts. See When a new file starts.
- Recent files: the files grouped by the survey that wrote them, newest survey first. Each group shows when it started, how many files it has and their total size. The page lists 20 surveys at first; Show more adds more.
Share files
Section titled “Share files”- Tap a file to share it through the Android share sheet (email, chat, cloud storage and so on).
- To share several, tap Select (or long press a file), tick files or whole surveys, then tap Share N files at the bottom.
Open in a file manager
Section titled “Open in a file manager”Tapping Location opens the folder in your file manager, or the Downloads app if the file manager can’t open a folder directly. If no app can, the page tells you where the files are.
You can also copy the files to a computer over USB: they are in the phone’s Download/NetworkSurveyData/csv folder.
Which files a survey writes
Section titled “Which files a survey writes”Each record type gets its own file. Cellular records are split by technology.
| Record type | File name starts with |
|---|---|
| Cellular | craxiom-gsm-, craxiom-cdma-, craxiom-umts-, craxiom-lte-, craxiom-nr- |
| Phone state | craxiom-phonestate- |
| Wi-Fi | craxiom-wifi- |
| Wi-Fi clients (NS Scout) | craxiom-wifi-client- and craxiom-wifi-probe- |
| Raw frames (NS Scout) | craxiom-wifi-raw-, as .pcapng files |
| Bluetooth | craxiom-bluetooth- |
| GNSS | craxiom-gnss- |
| Call records | craxiom-cdr- |
| Device status | craxiom-devicestatus- |
A device status file (location sources and battery level) is added whenever the survey logs Cellular, Wi-Fi, Bluetooth or GNSS to Log files. It is not written for a survey that logs only Phone state or Call records.
File names
Section titled “File names”Each name ends with the date and time the file was started, in the phone’s time zone: craxiom-lte-20261028-124350.csv was started on 28 October 2026 at 12:43:50. If two files of the same type start in the same second, the second one gets -1 added (craxiom-lte-20261028-124350-1.csv).
A file is created when the first record of its type arrives, so a technology the phone never saw leaves no empty file behind. The Call records file is the exception: it is created as soon as the survey starts.
For the columns in each file, see CSV files.
When a new file starts
Section titled “When a new file starts”A new file starts:
- For every record type, each time you start a survey that sends to Log files.
- For one record type, when its file reaches the size set in Start a new file every.
The choices for Start a new file every are Never (one set of files per survey), 1, 5, 10, 50, 100, 250 and 1000 MB. The default is 10 MB.
The size is checked every 5,000 records written to a file, so a file can grow somewhat past the limit before the next one starts. The Call records file is never split by size.
Related
Section titled “Related”- CSV files: the columns in each file
- Call records: calls, texts and tower changes, which only Log files takes
- Data streaming overview: send records live to a server instead
- Upgrading from 1.x: what changed about file logging in 2.0