These icons change with signal strength. UC is the faster 5G signal when you're not using 5G over 4G frequency. This is a carrier specific setting, control by them. Remember when AT&T uses 5GE to mislead users into thinking they were on 5G when, in fact, it was better/faster 4G connection? They paid a fine yet still do it even on phones that only support 4G. T-mobile uses 5G UC to designate connection using mmWave frequencies and other 5G icons when the connection is using 4G band
Correct. Every carrier has their unique way of identifying 5G using mmWave frequencies. UW may be confused with ultra wide band that is used for device to device data sharing. T-mobile calls it ultra capacity (UC) but all referring to faster 5G signal. Bottom line is that carrier define which icon they use depending on signal strength.
