Re: what must I do to ensure that I can use my phone as cheaply as possible when in Nepal?
Welcome to the community and thanks for posting your query with us.
I've provided a link here to our call charges so you can get an idea of what type of charges you can expect when using your phone in Nepal. If you have a Virgin Media landline you could sign up to our smartcall app which allows you to make cheap calls over WiFi. I've provided a link here to our smart call app help page if you wish to set this up before you go.