I canât seem to understand whatâs wrong with my landline, it is acting really weird. When somebody calls, the phone rings, but when I pick it up, it’s like sounds like someone immediately hung up on me. And the phone always says on the screen that there is “no line connectivity”. What is this how can I fix my AT&T dect 6.0 please suggest! I tried calling the care centre; obviously they have to take their own sweet time. I thought of fixing it myself, for a change, I have some really important calls coming in.