The Problem with "Hand Phone

I am increasingly concerned by the prevalence of Konglish terms like "hand phone" for mobile phone and "SNS" for social media in learners' writing. While these may be understood in a Korean context, they are not standard English, and using them in an international email or formal document creates a connotation of carelessness. A learner who corrects "hand phone" to "mobile phone" once and understands the register shift has made a permanent gain; a learner who never does has built a ceiling on their own accuracy.