What is Samsung Galaxy S21?
{{Infobox mobile phone | name = Samsung Galaxy S21<br />Samsung Galaxy S21+<br />Samsung Galaxy S21 Ultra<br />Samsung Galaxy S21 FE | logo = Galaxy S21 Logo 5G.svg | image = GalaxyS21.png | caption = From left to right S21, S21 FE, S21+, and S21 Ultra. | codename = Unbound | brand = [[Samsung Galaxy]] | manufacturer = [[Samsung Electronics]] | slogan = ''Everyday Epic'' | colors = {{Collapsible list|title=S21: {{Legend||N/A}} {{Legend||N/A}} {{Legend||N/A}} {{Legend||N/A}}}} | series = [[Samsung Galaxy S series|Galaxy S]] | modelnumber = '''International models''':<br />SM-G990x (S21 FE)<br />SM-G991x (S21)<br />SM-G996x (S21+)<br />SM-G998x (S21 Ultra)<br />(Last letter varies by carrier and international models)<br />'''Japanese models''':<br />SCG09 ([[Au (mobile phone company)|au]], S21 5G)<br />SC-51B ([[NTT Docomo]], S21 5G)<br />SCG10 (au, S21+ 5G)<br />SC-52B (NTT Docomo, S21 Ultra 5G) | networks = [[2G]], [[3G]], [[4G]], [[5G]] | released = {{Start date and age|2021|01|14}} (S21, S21+, and S21 Ultra) <br /> {{Start date and age|2022|01|03}} (S21 FE) | available = {{Start date and age|2021|01|29}} (S21, S21+, and S21 Ultra) <br /> {{Start date and age|2022|01|11}} (S21 FE) | discontinued = <!-- {{End date|YYYY|MM|DD}} --> | unitssold = | unitsshipped = | predecessor = [[Samsung Galaxy S20]] | successor = [[Samsung Galaxy S22]] | related = | type = [[Phone]] | form = [[Slate phone|Slate]] | size = {{ubl|'''S21''': {{convert|151.7|mm|in|abbr=on}} H <br /> {{convert|71.2|mm|in|abbr=on}} W <br /> {{convert|7.9|mm|in|abbr=on}} D |'''S21 FE''': {{convert|155.7|mm|in|abbr=on}} H <br /> {{convert|74.5|mm|in|abbr=on}} W <br /> {{convert|7.9|mm|in|abbr=on}} D <br /> |'''S21+''': {{convert|161.5|mm|in|abbr=on}} H <br /> {{convert|75.6|mm|in|abbr=on}} W <br /> {{convert|7.8|mm|in|abbr=on}} D <br /> |'''S21 Ultra''': {{convert|165.1|mm|in|abbr=on}}&nbsp;H <br /> {{convert|75.6|mm|in|abbr=on}} W }}{{convert|8.9|