While companies continue to invest in the digital transformation through desktop sites, many are ignoring the same level of investment in mobile apps.This can be a costly mistake as more consumers prefer to use their phones for purchases; if a company's mobile site & app experience is less than the consumer expects, they might turn elsewhere.Samir Kumar Sah, host of The Experience Business podcast, discusses the critical importance of mobile app investment and 7 key steps to a mobile-first strategy.