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Steve Clarke
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Steve Clarke

Discussion  - 
 
I'm seeing an odd behaviour that I've not seen before. I was travelling yesterday and left Cellmapper running on two different phones (one HTC One M9 & Moto X Force - both running Marshmallow, new API, etc.).

I've noticed that an some point in the journey (about 10 minutes apart while having good signal), both phones started logged PCI 0 for all cells/sectors. I've not seen this before.

Examples of cells recorded in this way are: Cell 30752 (234/30) at https://www.cellmapper.net/map?MCC=234&MNC=30&type=LTE&latitude=53.93971498359711&longitude=-1.0643537278319815&zoom=13&startDate=1/1/2000&endDate=2/28/2016&showTowers=true&clusterEnabled=true&tilesEnabled=true&heatMapEnabled=false&showOrphans=false&showFrequencyOnly=false&showBandwidthOnly=false&DateFilterType=FirstSeen&showHex=false&bands=0,3,7

and cell 506049 (234/15) at https://www.cellmapper.net/map?MCC=234&MNC=15&type=LTE&latitude=53.946921578277525&longitude=-1.0403923034667706&zoom=13&startDate=1/1/2000&endDate=2/28/2016&showTowers=true&clusterEnabled=true&tilesEnabled=true&heatMapEnabled=false&showOrphans=false&showFrequencyOnly=false&showBandwidthOnly=false&DateFilterType=FirstSeen&showHex=false&bands=0,20

Mapping today and it appears to be recorded PCI correctly again. Both phones are running Cellmapper v4.1.3. Any ideas what causes it and how to prevent it?
Account. You must be logged in to edit data. To register, click here to sign in, click here. Location Search. Tower Search. Settings. Group Towers. Signal Trails. Tower Heatmap. Show Hex Values. Filters. Show Towers. First Seen, Last Updated. Start. End. Display Towers. Show Low Accuracy Towers ...
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Minh Truong's profile photoSteve Clarke's profile photoIvan Zupan's profile photo
4 comments
 
So I think I found the issue. It was something to do with the old CellID API and Qualcomm devices. It would return a PCI or 0 (instead of -1) when the old API was queried, and this would overwrite the value from the new API (this is due to a Samsung fix, where the new API had a bad PCI value). It only happens with certain Qualcomm RILs from about a year ago. The new release last night should fix it.
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Steve Clarke

Discussion  - 
 
Uploads seem to be backlogging and even pushed uploads seem to be failing a lot. When it fails, it displays the error message below. Any ideas?
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Steve Clarke's profile photoIvan Zupan's profile photo
5 comments
 
I'll see if I can make that error a bit better.
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Steve Clarke

Feature Request  - 
 
Does Cellmapper map single-sector small LTE cells?

For example network EE (234 / 30) has a single sector LTE here (eNB 27953. Sector 0) at https://www.google.co.uk/maps/@53.7991013,-1.5425348,21z on the outside of the Horse & Trumpet pub however it never seems to show up on the map despite a single strength of -53dBm just outside.

While I understand that cellmapper uses triangulation for multi-sector cells, where the signal strength is that high but there is only one sector, shouldn't it map the cell at the strongest observed point? Steve
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Ivan Zupan's profile photoSteve Clarke's profile photoFrancis Pilkington's profile photo
10 comments
 
+Steve Clarke looking on ""ofcom"" site i can see ones EE 1800 MHz @ 9 dBW and Vodafone 2G 900 MHz @ 7.5 dBW
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Steve Clarke

Discussion  - 
 
For privacy, I often filter and upload CSV files rather than use live upload and have noticed that the CSV files are now twice as big as before but that one out of every two lines for the same coordinates doesn't seem to contain any useful data - always 2147483647 instead of country, network, tac and eci.

53.73596046,-1.57500803,167,2147483647,2147483647,2147483647,2147483647,-104,LTE,LTE
53.73596046,-1.57500803,167,234,30,11591,4048898,-88,LTE,LTE

What's the purpose of this extra CSV line?
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Saen Acro's profile photoSean Coutts's profile photoIvan Zupan's profile photoSami Jumppanen's profile photo
8 comments
 
There's a drawback on privacy zones: they can reveal you, if your area is void of tracks :) But the problem isn't CellMapper data alone I think. However, quite easily the tracks can reveal some things when connected with other information you've shared. I once did some "spying" based on the tracks in my town. I saw the home and by following the track I made a rough guess on the driver's profession. Another "case" I examined was a distinct pack of pixels over a house, like you would expect from a home user. But that address turned out to include an interesting firm :) Anyway, I used Street view and checked out the possible cars and bikes etc. Just to see what you can find. The questions are: did I find anything special and how could the data be used? No, even if I tried to think, I found nothing special and don't know how to use that little I saw.
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Steve Clarke

Discussion  - 
 
Since I've upgraded my Nexus 5 to Lollipop, I've noticed that Cellmapper often stops recording in the background if I switch to Google Maps or load a complex webpage or both.

The only way to prevent it stopping seems to be keep switching back to the Cellmapper app. Is the a way to keep Cellmapper recording in the background regardless of other app activity?
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Sami Jumppanen's profile photoIvan Zupan's profile photo
3 comments
 
Data is not recorded during phone calls, as most phones stops updating the CellID.  I'll test it with the new API to see if perhaps that fixes it so that I can enable recording in-call.

I also tried to replicate this GPS issue today but I couldn't.  I'll give it another try tomorrow to see.
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Steve Clarke

Discussion  - 
 
Cellmapper beta seems to have broken for me today. It continuously complains of "GPS fix too old" even when GPS is fixed and all other apps have very precise location. It hasn't recorded any data since the last update. Phone is Nexus 5.
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Ivan Zupan's profile photoSteve Clarke's profile photo
4 comments
 
+Ivan Zupan I restored settings one by one when I downgraded and "Smart time sync" app keeps phone time accurate to with 1-2s of GPS time. GPS was locked according to "GPS status" app. Thanks for the ideas - if it reoccurs, I'll do more debug.


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