ZURICH, March 30 : Mobile payment app usage stalled in Switzerland last year, a Swiss National Bank survey showed on Monday, with cash remaining popular as a way of paying for goods and services in person. A large majority of respondents in the survey were in favour of the continued use of cash, with only 2 per cent keen to abolish it, saying it is impractical or used for illegal activities. Mobile payment apps such as Switzerland's Twint or Apple Pay were used in 17 per cent of transactions in