Android phones show 1 bar pretty reasonably and fair. To illustrate this, I have 1 bar on both my SIM modules right now, which translates to the -125 dBm signal

Android phones show 1 bar pretty reasonably and fair. To illustrate this, I have 1 bar on both my SIM modules right now, which translates to the -125 dBm signal on both. So the connection is up, but it is borderline low. Wifi-calling to the rescue :)