How to NMLL your iPhone

The following is a way to display your signal strength in decibel meters (dBm.) This will accomplish the same thing on an iPhone that holding the alt key and pressing NMLL will on a blackberry. In order to do this, you'll need to run iOS 4.1:

• Go to phone > keypad.
• Dial *3001#12345#*
• Tap call.
• You're now in "Field Test Mode" iPhone should show dBm instead of bars.
• To keep the display, simply force quit the app (Hold sleep wake button until it shows the swipe bar to power down. Then hold the home button until the app disappears.)
• To return to bars, tap numbers.

This is the best shortcut I've seen since the screenshot. Have fun with it. :)