Signal 2 - Fetch Coverage Data and Locate Towers - iOS 6 Compatible
Signal 2 (recently updated) is a utility created by iPhone Dev Team member planetbeing. The application, just like the original Signal, displays information about the cell tower your iPhone is connected to as well as neighboring cells.
Planetbeing has designed the app to detect and map the location of all nearby cell towers so that users can easily get a good idea of their coverage or where to go to get the best cellphone reception.
Combine this with the free iPhone carrier unlock that planetbeing helped to create, and a user can simply swap SIMs allowing them to easily determine which carrier is best for based on the reception coverage. The Technical data is displayed on a map overlay, including RSCP (signal strength) in dBm and Ec/N0 (signal quality) to all neighbors, the PSC of the cells, as well as the frequency each cell is broadcasting in.
Signal 2 is now available on Cydia and is compatible with any jailbroken iOS device with cellular radios running iOS 5 and above. The app runs for $3.99 and goes to a good cause.
Website: Signal 2 - iPhone app by planetbeing