On 31st May 2015 I tried to use WiFi at MAS, while registering itself I got problem, destination has to be selected, to my dismay Mangalore was not found in the list.
I continued by selecting Hyderabad, I didn't get SMS for activation of WiFi services till I boarded train - 2 hrs approx.
I tried with 4 mobile numbers - all AP BSNL - didn't get SMS.