One of the most popular leaksters, evleaks, says that the Galaxy S9 and S9+ will be launched on February 26th. This claim comes from the alleged contact between evleaks and a, quote, ”C-level executive at a major casemaker”. Evleaks believes that the phone will be available for pre-orders starting March 1st. Release is said to take place on March 16th. Usually Samsung unveils its Galaxy S series phones a day before the MWC; why this year is different, I do not know.
By the way! Since the Galaxy S9/S9+ launch is so close, you can take most leaks that will surface online as truth. Smartphones rarely change this close to their release date.