2019 is the year that 5G arrived for early adopters. 2020 is the year that 5G becomes mainstream. At least that's what the big market players and those building 5G smartphones want us to believe. Although fifth-generation networks provide amazingly fast speeds in the right conditions, most smartphone owners aren't living on the few streets that offer mmWave connections. Let alone own a compatible $1,000+ handset. To put it bluntly, 5G hasn't been at the forefront of consumer buying habits in 2019. However, a number of key developments mean that this situation could well change in 2020. Here's what to expect from 5G networks and 5G smartphones in the new decade.