So far, three model numbers are linked to the future Galaxy S10 models - SM-G970, SM-G973 and SM-G975, which should correspond to the Galaxy S10 Lite, S10 and S10+. So the fourth one comes as something of a surprise. The new addition to the rumor mill is SM-G977 and the only variations of this model are the American SM-G977U and South Korean SM-G977N. The European SM-G977F is still nowhere to be seen, which suggests that this particular version is not far into the development process like the three main ones. There's a great chance that the newly surfaced model number belongs to the...
Source: https://www.gsmarena.com/fourth_samsung_galaxy_s10_model_pops_up_could_be_the_5g_variant-news-34710.php