The S23 is the first Samsung phone to use Nvidia's NVDA.O GeForce RTX 4070 graphics card for games with heavy processor demands and for live-streaming playability. By Joyce Lee SEOUL, Feb 1 (Reuters) - Samsung Electronics 005930.KS unveiled its latest premium smartphones on Wednesday, in a test of its brand power as the market for mobiles undergoes unprecedented contraction. The Galaxy S23 smartphone series has better cameras and faster chips than its predecessor, but analysts said early sales would face weak demand as consumers spent less on discretionary goods amid surging inflation.