Complete BlackBerry Secrets Blog

The standard signal strength display on a BlackBerry uses the familiar “five bars” graphic — the more bars you have, the better your signal strength. If you prefer more precision, however, you can have the signal strength display in actual numbers.

To change your signal strength display:
1. Go to the home Applications screen and hold down the ALT key while entering the key sequence NMLL.
2. To return to the standard graphical bar display, enter the same key sequence, ALT+NMLL.

The numeric signal display represents your signal strength in decibels (dB).