Ncell is best choice if u want something to be ready in 20 minutes and you need to be mobile as well while in Nepal. Just go to Kingsway and buy the sim and hsdpa modem and u r up. I was working remotely while in nepal during last week . I don;t exactly know how fast u need. Usually the wired connection will be faster than the wireless ones. Do u really need the wireless ones? Subisu has really fast one. U can ask smbd already in ktm establish the service such that it is ready when u arrive in ktm. Are you planning to be mobile while in Nepal or u will just work off from one location only?