dial91 app: It's Not as Difficult as You Think

https://www.slideserve.com/b5tfrpt500/meet-the-steve-jobs-of-the-dial91-number-industry-powerpoint-ppt-presentation

Calling is one of the most preferred ways to communicate taking into consideration others. And this is one of the oldest communication methods past apps took over. though calling in a specific area is quite cheap.