Is it possible to activate mobile banking while in abroad?

So, I have a brother abroad.

Bahira janu vanda aagadi mero dai ko Nepal Bank ma saving account chai thyo but online banking like mobile banking active chai gareko thyena. Ani aahile chai aaba activate garna milxa ki nai?

I still have his: Citizenship, Cheque of same bank and account details.

So the question is : Can mobile banking be activated while he is in abroad?

Is it possible for a family member in Nepal to activate on his behalf?

And what about documents?

Any advice?