yes, what you need to do:
1/ collect all KPI in your phone
– that’s a huge work because an operator doesn’t need “CSSR”, or CDR… they already have it ! so they would want more, such as GPS position of your phone, radio measurements, codecs used, FER, HO info, neighbours, etc etc. Imagining and finding all those KPI will take a lot of time
2/ you need to upload this info in a server available somewhere, so that the operator can retrieve these info.
I must tell you that operators are already able to collect lots of radio info from calls, except GPS position (but that will change in one or two years, i’m sure…)
but creating such an app is a great way to learn about radio, that wuold definitely look very good in your resume 😉