GSM modem - get signal strength

I have setup a gsm connection through network manager (USB dongle, raspberry pi). It connects and works fine by managing it with nmcli. What I would like to see is the signal strength so that I can decide what the best spot is to put the modem/computer. How is it possible to see it on CLI? I have been unable to get this piece of data with nmcli or mmcli. Update: Signal is provided as part of output on mmcli: Status | lock: 'none' | unlock retries: 'sim-pin (3), sim-pin2 (0), sim-puk (10), sim-puk2 (10)' | state: 'connected' | power state: 'on' | access tech: 'umts' | signal quality: '51' (recent)