By (author unknown), MacNN | The Macintosh News Network – September 08, 2010 at 10:30PM
Following today’s launch of iOS 4.1, discoveries have been made both in the firmware itself and for new updates in the App Store. The update is now known to have restored the Field Test Mode that had been pulled in all versions of 4.0. Dialing *3001#12345#* and tapping Call will bring up a signal measurement in dB, with higher numbers typically better; hitting the home button returns to normal….
Cisco IOS – Operating system – Apple – Network – Protocols