There are several online sources offering essays in the Hindi language about mobile phones and communications. Unfortunately, I do not speak Hindi myself, so you will need to visit the websites listed below to see if they have what you need.
- meritnation.com › ... › Hindi
The Hindi language Wikipedia has an article on mobile phones under hi.wikipedia.org/wiki/मोबाइल_फ़ोन which might be a good place for a few ideas for an essay of your own.
You might also try Google Books to see if there's any Hindi language books on mobiles available to read for free. Play.google.com has some essays in Hindi, so check there for mobile essays.
For other Blurtit answers to this topic, check Where Can I Find Essays In Hindi Language? and Can I Find Essay On My Hobby In Hindi Language? Or you can watch this YouTube National Geographic film about mobile phone coverage in India: