The phone makes an SOS sound when you try to soft reset it the way you would an iPhone 7/7 plus, even though they're both on the iOS 11. If holding the power button and volume button down at the same time does not reset it, then how would you soft reset the iPhone 8/8 plus?
null-OTHER, iOS 11, iPhone 8/8 plus
On an iPhone 8 or iPhone 8 Plus: Press and quickly release the Volume Up button. Then press and quickly release the Volume Down button. Finally, press and hold the Side button until you see the Apple logo.
On an iPhone 8 or iPhone 8 Plus: Press and quickly release the Volume Up button. Then press and quickly release the Volume Down button. Finally, press and hold the Side button until you see the Apple logo.
According to this page in the iPhone User Guide, it mentions the "Side button" rather than the sleep/wake, and the language differs slightly from the iPhone 7 series. http://help.apple.com/iphone/11/#/iph3e503f70
He do you soft reset the iPhone 8/8 plus
