Upvote:1
The flow of information between British India and the UK during World War II depended mainly on telegrams and written correspondence carried by ship. Naval warfare around the UK itself probably had an indirect impact. With respect to the telegraphic infrastructure within India itself, the main threat was not Japan, but the Quit India movement. In 1942, rebels destroyed 332 railway stations and 945 post and telegraph offices. For more info see India's War by Srinath Raghavan.