What is the 2 meter calling frequency UK?

Many repeaters (2m, 70cm) you do not have to call CQ. You can just say “<your FCC callsign> <mobile, portable (as needed)> listening!”

In the UK the 2m calling frequency is 145.500 MHz FM .

The conventional wisdom in amateur radio is that we should not call CQ when using FM on the VHF and UHF bands, especially on repeaters. The reasoning for this is that during normal VHF/UHF FM operating, radio amateurs are tuned to a specific frequency and will easily hear a call on FM.