Well-known cinematographer Rathnavelu on Monday said challenging as it was to shoot without mobile coverage for an upcoming yet-untitled Telugu film, there was something good about the experience.Rathnavelu is currently working on Ram Charan's project with director Sukumar."The 20 days without mobile network filming in Godavari district was a nightmare! Coming back to city realised the mobile detox was good though," Rathnavelu tweeted.The makers over the weekend completed the film's first schedule in Rajahmundry.A rural-based romantic saga, the film has a 1980s backdrop. It also stars Samantha Ruth Prabhu.Ram Charan has gone fully rural for this project.The film is being produced by Mythri Movie Makers.