iOS has long needed an app to display info about the cellular connection- we have Field Test but it's rather hard to type in *3001#12345#* while driving.
So, I made CellularInfo. Supports all iPhones on iOS 8.2 and below.
For now it simply displays most of the information from the "Serving Cell Info" section of Field Test.
It's in a (closed) beta at the moment.