Although Samsung started with Solstice lines, and has made clamshell design cell phones,[15][16] [17][18] Samsung's flagship mobile handset line is the Samsung Galaxy S series of smartphones, which many consider a direct competitor of the Apple iPhone.[19] It was initially launched in Singapore, Malaysia and South Korea in June 2010,[20][21][22] followed by the United States in July. It sold more than one million units within the first 45 days on sale in the United States.[23]