well , did you ask them if they have signed up for that service? i don't know wether in Nepal you have to sign up for them or not. And did you try dialing: 011 first then 977 then the number? i have tried for 011-977-984 ; 011-977-985 works . I am sure they are not all from NTC , i am sure some have mero mobile too. how do you distinguish between NTC and Mero mobile just by knowing the number???