cpauya
Head-Fier
It is interesting feedback, because it implies that your phone is always using the same cell mast, and so something else would need to be triggering the change in cell power.
I am not an expert in how the cell power changes, but I wonder if an incoming email or sms would cause a temporary increase in cell power.
It could have to do with the phone checking for notifications too. I always assumed that's what caused the random EMI/RFI pulses phones emit.
Best way to test if it has to do with power changes is to try airplane mode.
Ah to be honest I haven't tried that yet (airplane-mode). Will do that tomorrow as I'm sleepy now... but in my case, iPhone notifications do emit sound which should have been heard on the Mojo.