It is in Hindi. A literal translation would be something like "blow your fun, not your data", where the first "blow" means "expand", and the second "blow" is the traditional "explode" or "destroy".
Thanks. I'm from India and I speak Tamil. It is eldritch when people use Hindi as representative of the whole country. Hindi, along with English, may be an official language - but more than half the population do not speak it!