You have just installed your CEL-FI system. You have followed the directions and maybe even gone through some basic online troubleshooting steps… but you do not see any more bars on your mobile device. According to the bars on your handset you are not getting better signal after installing your CEL-FI Booster Device.
Even if your CEL-FI is installed correctly and the service you experience is substantially improved, your handset may not show these improvements with higher signal bars.
The easiest way to confirm that the CEL-FI is working is to remember what your initial need was. For example, if you had no coverage in this area before and now you do, or if you were experiencing dropped calls before and now you are able to hold calls without an issue, you can say without a doubt that your handset is getting a better signal thanks to your CEL-FI Smart Signal Booster!
Every mobile device has different algorithms for selecting bars and the method of putting your phone into Field Test Mode. Placing your phone into Field Test Mode will allow you to view raw signal strength, as demonstrated in the video above. Raw signal is the only way to get true signal strength readings from most smartphones. Below are updated instructions to the most popular mobile brands.
If you do not see a working code for your phone, please contact us.
The raw signal strength can determine if your handset is getting signal from the Coverage Unit. With the Coverage Unit plugged in, go to the location of your CU and dial the Field Test Mode Code for your phone, remember this number. Now unplug your Coverage Unit and watch your signal strength change, it make take a few minutes for your phone’s readings to update. Keep in mind, a smaller the negative number equals stronger signal. For example, if your signal strength jumps from -111 to -100 your signal is 10 times stronger with CEL-FI than it was without CEL-FI.
While the number changes might seem slight, even 3 numbers lower is 2 times stronger than before. The cellular scale is not 0 to 100, but the range of usable cellular LTE signal is -120 (just barely usable) to -60 (about the best you will find). Here is a simple chart to give you an idea of just how BIG the “little” improvement really is.
|Improvement in handset’s signal value in dB (with Cel-Fi CU on)||How much stronger the signal really is|
|Improved by… 03||2x Stronger|
|Improved by… 06||4x Stronger|
|Improved by… 10||10x Stronger|
|Improved by… 15||30x Stronger|
|Improved by… 20||100x Stronger|
|Improved by… 30||1,000x Stronger|