India, Feb. 15 -- We're less than two weeks away from initial 5G handsets and prototypes arriving on the shores of sunny Barcelona at Mobile World Congress, but there's a good reason to look before you leap to a new handset on the next generation of wireless networks.

Here's what we can expect at Mobile World Congress:

We expect Samsung Corp. to launch its S10 line, including a 5G model in San Francisco next week, gaining a march on device rivals at MWC. In fact, Samsung appears to have prepped to be the key 5G supplier to US operators in 2019.

Samsung is likely to deliver many of the early 3rd Generation Partnership Project (3GPP) 5G New Radio (5G NR)-capable phones in the first half of 2019. AT&T Inc. (NYSE: T) and Verizon Communicatio...