Anything higher than -70dBm is considered good signal power, but what would be the theoretical “maximum” value that you could achieve/have seen “in the wild” on regular consumer hardware (e.g. smartphones) and an average cell tower, without any data transfer issues? A measurement that would be read out if you were to hold a phone out standing very near an average LTE cell tower? 0 dBm? Probably too high. -30?