I think banks doing anything with blockchain is purely a marketing stunt and so is this thing with telcos. To me blockchain has to be decentralized and has to involve crytocurrency else its just age old database tech with some new tweaks to improve data storage.
As long as things remain centralized, it doesnt matter whether you use a blockchain or just make the existing system more transparent.
BBVA, recently did a loan transaction on blockchain and the two nodes involved in the blockchain were the bank and its client. That doesnt change anything and is not value accretive. BBVA just increased its marketing and tech budget and destroyed shareholder value without improving the transaction in any way.
And Indian Telecom sector has to worry about continued onslaught from jio. Now jio is entering into corporate postpaid business and soon wifi for homes and offices pan india. Vodafone is busy merging with idea and if vodafone parent isnt worried about blockchain, vodafone india wouldnt be either. They are infrastructure providers and can at most invest in decentralized versions of content platforms and user aggregating platforms through venture capital route. Rest is marketing by using the blockchain buzzword.