My question is simple but I haven\'t found a good answer anywhere. My question is this: Is there a way through either the iOS SDK or third-party frameworks to get cell tower
There is no official way to do this as far as I know. iOS SDKs abstract that info to a single and easy to use location API.
The application you link is probably using private APIs from iOS. That means that developer is using undocumented functions from iOS. If you really want to find more about it, you can try contacting him.
Also check this: iOS Private API Documentation