What is meaning of negative dbm in signal strength?

Question

When we try to get nearby cells and their LAC, MNC, signal (and while using other android apps) we are getting signal as negative value (like -85dbm). How should I take this? Sh

Answer 1

At ms end Rx lev ranges 0 to -120 dbm Mean antenna power which received at ms end alway less than 1mW.

Thats why it always -ve.