Turning off LTE does not help phones calls or texts. LTE is data only. Turning off LTE allows one to get a CDMA reading. All phone calls and texts are handled by CDMA. Just wait a bit for the signal reading to change from LTE to CDMA. As I noted earlier, my LTE is -106 but my CDMA is -120. My map is like yours in that it shows complete voice coverage. It is just not accurate.
I agree turning off LTE should not help. What I was getting at is whether it could be the LTE radio grenading the 3G radio or the transition/drop from LTE to 3G causing it. As I said, others tried this in the google code/bug report thread and it did not help.
My CDMA signal is stronger than my LTE signal. I can do some signal mapping tonight in various places in my house. The dropped calls have mostly occurred in my kitchen so perhaps there's a black hole area there. Won't know until I can map out my signal.
Speaking of which, is there an app that will track your signal every 1s or something and log it? I know the about phone info only updates periodically, but can the signal levels be polled directly from sysfs/sysctl or something similar?
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