USB-C
2015 - MacBook
2016 - Android
Split-view
2012 - Note II
2014 - iPad
2016 - Android
PiP
2012 - Android (via third-party apps)
2015 - iPad
2017 - Android (officially)
Gesture controls
2009 - webOS
2011 - QNX, Meego
2013 - BB10, Sailfish
2017 - iOS11
Water/dust resistance (on flagships)
2013 - Xperia Z
2014 - Galaxy S5
2016 - iPhone 7
2017 - Pixel 2
Dual front speakers
2013 - HTC
2014 - Sony
2016 - Apple
Raise to wake
2013 - Moto's Active Display
2016 - iOS10
Double tap to wake
2011 - Nokia
2013 - LG
2014 - Sony, HTC, Oppo
Removal of headphone jack
2016 - Motorola, Apple, HTC
2017 - Xiaomi, Essential, Google
Fast charging
2014 - OPPO, Motorola (Google)
2015 - Samsung, LG
2017 - Apple
Wireless charging
2009 - Palm
2012 - Google (LG)
2014 - Samsung
2017 - HTC, LG, Apple
Fingerprint scanner
2011 - Motorola
2013 - Apple, HTC
2014 - Samsung, Huawei
2015 - LG
Dual lens
2014 - HTC
2016 - LG, Huawei, Apple
2017 - Samsung
Wide-angle lens
2016 - LG
2017 - Motorola
Telephoto lens
2016 - Apple
2017 - Samsung
BTW, wide-angle > Telephoto.
Most innovative to me -
Palm (RIP)
HTC
LG
Motorola
Nokia
Samsung
Apple
Important phones in history -
2007 - Apple iPhone
2009 - Palm Pre
2011 - Samsung Galaxy Note, Nokia N9
2013 - HTC One, Motorola Moto X, LG G2
2014 - Apple iPhone 6 / 6 Plus
2015 - Samsung Galaxy S6 edge
2017 - Apple iPhone X?
Sony Ericsson Xperia Play (SEX PLAY), Yotaphone, and Meizu Pro 7 will never get any love for their uniqueness.
Where has Apple copied the most from? Mostly HTC followed by Palm and Motorola.
HTC One M7 = iPhone 6 (4.7")
Zoe = Live Photos
Antenna lines
BlinkFeed = News Widget
Dual front speakers
Gesture controls
Always listening
Wireless charging
Fingerprint scanner
Raise to wake
S-Pen = Apple Pencil
HTC One M7 and M8 were truly remarkable devices that influenced Apple just like how far ahead Palm was with gesture swipes and wireless charging back in 2009.
Motorola is the father of phones. Everybody is influenced by them. Fingerprint scanner in 2011. Always listening and raise to wake in 2013. I rank where Apple copied most from is HTC, Palm, and Motorola. Then Palm and Google in software.
It's a Apple/Samsung duopoly. Palm is all but forgotten. Sony and Nokia aren't what they once were. HTC, LG, and Motorola will never get their props.