There is no law that states that the service charge is illegal. On the contrary, the government levies tax on the service charge collected by eateries. How can it be illegal if tax is levied on it by the government?
He was the first President of India who, had invited students and others to interact with him any time and for this purpose he had made his e-mail public in times when such things on part of a dignitary were considered to be nothing short of a taboo. In 2006, he interacted with Vice Chancellor of Punjab Universities to push them to introduce skill development as a key feature of university education.
Search for an app in play store named text secure. It has encryption, add only friends you approve option & also features turn off screenshot/screen capture option. Though not as user friendly as whatsapp, hope people who are concerned about privacy might like it.