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SignalCheck - Android app to monitor your 2G/3G/4G LTE signal strengths

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13 hours ago, mikejeep said:

I hope nobody is afraid to bring anything to my attention..? I know there are Samsung changes that I need to get in there. Just the same old song from me, haven't been able to get enough time to update the app. It does weigh on me, I take a lot of pride in the app and hate when updates lag! Unfortunately real life (and real job) have to take priority.. stop if you've heard this before.. ?


Quite a number of us have been looking at this issue for months, which I call Sequential GCI Sectors (SGS). For those unfamiliar it eliminates the special 8T8R market GCI and reorders all GCI band sectors first by sector then by band.  Without software help this is uncomprehensible to most people.

It took a while to get a reasonable sample of data from all sectors from various sites in various tracked markets.  Sprint was also making changes and initially had various models in different markets.  This has only been seen in Samsung markets, although I have looked at data from ALU and Ericsson markets. It should be noted that Mini Macros and B41 small cells are not affected.  It now seems to have stabilized for a while around what is shown in ingenium's chart:

6 hours ago, ingenium said:

Here's a spreadsheet that I put together that shows the new GCI layout, along with some example setups (with earfcns). https://docs.google.com/spreadsheets/d/1Zhb37AO4gh2kWOz598FBrWKK478RvujRzN1G4TDLcF4/edit?usp=sharing 

Implementation is growing and is getting faster.  Through the many logs I analyze I have seen it pop up in more and more markets.  Still uncertain as to the reason.  The latest theory is for 4x4 MIMO and 256 QAM with a long line of failed theories behind that one. 

There are areas of uncertainty surrounding 1) counties with portions of various b41 radius on different frequencies and 2) the handling of 4th and 5th carriers.  We are hoping that Sequential GCI Sectors (SGS) in Columbus and Cincinnati will soon spread to such areas so we have a better data sample.  Currently we only have the area around Youngstown to work with in this regard.  Joski1624 has been key in this along with ingenium.

7 hours ago, Flompholph said:

I am afraid because it will then make sprints choice to change B25 and B26 sectors real. The changes are only confirmed on less than 10% of Pittsburgh sites. It just screws those of us that use scripts to sort our logs. It almost eliminates phones that don't show EARFCN from contributing data because of the mixed (old/new) sectors. I also lose the ability to have a continuous log that I can just dump data into then keep the best data when it gets to big because because of the changes. 

I have handled this with a cutover date for GCIs and tracking expired b41 GCIs.  Early on implementation stretched out over a couple of weeks, but it now seems entire sites are done at once.  I process logs first to find any Sequential GCI Sectors (SGS) sites which are ranked into Yes, Maybe, and No.  "Yes" is determined unique GCI endings which can be increased if you have detailed spreadsheet data on the site that is reasonably current.  These become Approved SGS sites with the earliest one becoming the cutover date which is stored for future use.  "Maybe" are unique GCI endings that don't have an expected EARFCN.  Many of these are transition errors but a signification number are for sites where more data is needed.  These become possible SGS sites and are flagged for followup. 

The approved SGS site data is then processed for new carriers and missing/changed PCIs.  B41 is converted back to its old GCI including GCI sectors for this purpose plus to provide data for the expired B41 sites.  The expired b41 sites is also used for Mini Macro GCIs that have been replaced with 8T8R in case they appear elsewhere in the future.  This effort allows old spreadsheets to be retained.    Should a market fully convert (none found so far) to Sequential GCI Sectors (SGS) it will be worth revisiting this multi-step process to simplify it. 

The unresolved issue of sites in counties with portions of various b41 radius on different frequencies is the most difficult for SCP.  Sheets may have to track earfcns for those areas and/or store the SGS sectors for them to be properly rebuilt for SCP "national" logs. 

Markets with sheets will want to let SCP know the approved SGS sites as users may not be on the right band or sector to know independently. This way regular sites could be stored in their compressed format while only the SGS sites would need more entries. SCP may need to track SGS sites for markets without sheets based on past key GCI sectors. 

This may also be the right time for SCP to allow the direct importation of true site lat/longs as RSRP allows for easier detection of EARFCNs in transition. 

Another issue that would help is a more resilient error handling (retries) for rooted modem earfcns.  Currently this is often tripped by other apps such as LTE Discovery (used for its airplane mode like ability) or Network Signal Guru  (for bandwidth, MIMO and QAM detection).  Presently you must exit and restart SCP to regain EARFCN detection in such cases.

Based on past history, it is safe to assume that Sprint will not totally upgrade all sites in a market to Sequential GCI Sectors (SGS), but  it will likely dominate  -- it will just take a while in true Sprint fashion.  Many of us S4Gru folks have retained older phones  (I have 4) for assigning to different signal tracking purposes.  The general public often has older phones just like these as their main phone.  Without Sequential GCI Sectors (SGS) support older phones in SGS areas may soon become worthless for interactive signal detection and learning. 

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Mike, over the last two days, SCP has suddenly started triggering the system battery usage warning. I've tried killing the app, restarting, and rebooting the phone. It won't go away. The notification icon for SCP has also disappeared. I have not uninstalled and re-installed the app yet, I want to let you know. I will send a bug report in a moment. 

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SGS Reference Table (Sequential GCI Sector)


Band/Sector  SGS              SGS      Band/Sector

B25  -A       00              00       B25  -A

B25  -B       09              01       B25#2-A

B25         12              02       B26  -A

B25#2-A       01              03       B41#A-A

B25#2-B       0A              04       B41#A-B

B25#2-Γ       13              05       B41#A-Γ

B26  -A       02              06       B41#C-A

B26  -B       0B              07       B41#C-B

B26         14              08       B41#C-Γ

B41#A-A       03              09       B25  -B

B41#A-B       04              0A       B25#2-B

B41#A-Γ       05              0B       B26  -B

B41#B-A       0C              0C       B41#B-A

B41#B-B       0D              0D       B41#B-B

B41#B-Γ       0E              0E       B41#B-Γ

B41#C-A       06              0F       B41#D-A

B41#C-B       07              10       B41#D-B

B41#C-Γ       08              11       B41#D-Γ

B41#D-A       0F              12       B25 

B41#D-B       10              13       B25#2-Γ

B41#D-Γ       11              14       B26 

B41#E-A       15              15       B41#E-A

B41#E-B       16              16       B41#E-B

B41#E-Γ       17              17       B41#E-Γ

B41#F-A       18              18       B41#F-A

B41#F-B       19              19       B41#F-B

B41#F-Γ       1A              1A       B41#F-Γ

Keep this for use on phones without EARFCN reporting at SGS sites until SCP can handle them.

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Well, I know there's no Signal Check for IOS...but how I wish there was. That said...is there an IOS app that can tell a user what Signal Check ferrets out? None and I mean none of the apps I've tried can tell you what network you are roaming on. Maybe Apple prevents the hardware from divulging that info? 

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54 minutes ago, jonnycando said:

Maybe Apple prevents the hardware from divulging that info? 

You've answered your own question. 


Outside of jailbreaking, there's not much else to do to get that info.

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1 minute ago, greenbastard said:

You've answered your own question. 


Outside of jailbreaking, there's not much else to do to get that info.

I'd like to jailbreak...but alas, I am a beta tester so it would go right back to jail with every update which is sometimes days apart!

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Good news.. SignalCheck Pro update coming within the hour on Google Play! Below are highlights of the changes; I will come back and add some more details within the next few days. Sorry it took so long (I know, I say that every time) and there is still plenty of work to do.. a major issue I have already started work on is having Sprint site notes appear regardless of the PLMN your device is reporting (some new phones are showing 312530 instead of 310120). 

  • Added indicators for AT&T LTE band 14 FirstNet cells.
  • Added indicators for Clearwire LTE band 41 third carriers.
  • Added indicators for Rogers LTE band 2, 4, 7, and 17 cells.
  • Added option to disable adding/editing site notes from the main screen. (Pro)
  • Added option to use new patterns to identify Sprint LTE cells in Samsung markets reconfigured in 2018. (Pro)
  • Added system shortcut for voice band mode selection. (Pro)
  • Added workaround for improper identification of some band 66 and 71 cells due to a known Android bug.
  • Changed action bar icon on main screen to be animated; new option to use previous static icon. (Pro)
  • Changed action bar title on main screen to match user-selected text color. (Pro)
  • Changed alerts to be off by default. (Pro)
  • Changed diagnostic routine to use SSL.
  • General internal code enhancements.
  • Improved runtime permission handling.
  • Resolved issue with app closing when Preferences menu is selected or orientation is changed and Background Service is disabled. (Pro)
  • Resolved issue with invalid LTE neighbor cell displaying with PCI 0 and 0 dBm. (Pro)
  • Resolved issue with some incomplete LTE indicators when option for new Samsung markets is enabled. (Pro)
  • Updated references to new domain (signalcheck.app).


As always, I appreciate everyone's support. Please help me out by submitting a review on Google Play after you update!


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I just last night got a new Moto E5 Play (Unlocked) for AT&T.  I've locked it to Band 14 and here it is:


Would it be possible to instead call it "LTE 750" rather than "LTE 700" to be able to differentiate it at a glance from Band 12/17.  I know that will make it inconsistent with Verizon, but Verizon only has Band 13, no 12/14/17 to confuse it with.

- Trip

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i like the voice band mode selection feature and to me, should be #1 on the above list of changes.  testing for adding LTE band selection in the next release? ;)

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4 hours ago, Trip said:

Would it be possible to instead call it "LTE 750" rather than "LTE 700" to be able to differentiate it at a glance from Band 12/17.  I know that will make it inconsistent with Verizon, but Verizon only has Band 13, no 12/14/17 to confuse it with.

Or Maybe "LTE 700PS"?

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On 10/27/2018 at 10:49 AM, Trip said:

I just last night got a new Moto E5 Play (Unlocked) for AT&T.  I've locked it to Band 14 and here it is:


Would it be possible to instead call it "LTE 750" rather than "LTE 700" to be able to differentiate it at a glance from Band 12/17.  I know that will make it inconsistent with Verizon, but Verizon only has Band 13, no 12/14/17 to confuse it with.

Sure, I can do that. I'll just have to make new icons because there are no "LTE 750" ones yet. I'll make a note to get this done It will be in the next beta update so you can make sure it works properly. Aiming for late next week right now.


On 10/27/2018 at 1:31 PM, swintec said:

i like the voice band mode selection feature and to me, should be #1 on the above list of changes.  testing for adding LTE band selection in the next release? ;)

Glad it's useful for you! Unfortunately, I don't know of a method to select LTE bands yet.. the Voice Band Selection menu is built into Android, I just wasn't aware of it until someone showed it to me. LTE band selection is a different animal, that's usually configured on an engineering screen which is 1) inaccessible to third-party developers and 2) different on each device. But if I can find a way, I'd love to do it!


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    • Mini Skirt

      Sent from my SM-N920P using Tapatalk

    • Hopefully it'll be released soon since VoLTE was just activated today here. It's working on my S8+. My understanding is only the screen and the battery are different between the S8 and S8 active models. If that's true and all the other internals are the same, I don't know what the holdup could be. 
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