If you're the kind of iPhone owner who likes as much technical information as possible, or you're just looking to improve your cellular signal, there's an app for that. Signal 2 is now available for jailbroken iOS 6 devices from developer planetbeing. The app offers maps of the closest cell towers and those that are actively communicating with your iPhone.
Detailed information is displayed from the cellular baseband, including signal strength, signal quality and the frequencies each cell tower is using to broadcast. Neighboring towers are also detailed, and the mapping can help you figure out where to move if your current signal is weak.
In all, Signal 2 provides a wealth of interesting data that is normally hidden in everyday iPhone usage. Planetbeing notes that when the iPhone is in 3G mode, it can take a few hours before the Signal app can learn where the towers are located. The device needs to connect to several local cells before it learns how to associate all of the relevant data and displays their location.
Signal 2 is available on Cydia from the BigBoss repo for $3.99. Check here for instructions on how to jailbreak iOS 6.x with evasi0n. You can also find out how to purchase and install Cydia tweaks with this guide.