What Nagarjuna speaks in this movie is not actually Telangana dialect. It is a Rayalaseema dialect although he does not speak it with good fluency. I thoroughly enjoy fullhyd reviews in general - and such lapses on issues like this are a bit disappointing.
Ragada has Nagarjuna playing a guy from Kadapa who speaks in the Telangana dialect. It's so illogical that you know that the director must also be aware of that, and all your Telugu movie-watching experience tells you that it will be explained in the end, and that the explanation will be a load of BS. Well, it's not. Explained, that is. That's like someone you have contempt for, not even remembering your name.
That also explains the IQ behind Ragada in general. Nagarjuna's last release disappeared from the theatres in 3-4 weeks, and Ragada looks like it'll plumb the same depths. Mad....