What Apple did: Most historians seem to agree that the Apple II was the first truly successful personal computer to be mass produced, though some will argue that the Commodore PET, which preceded the Apple II by five months.
http://www.applegazette.com/feature/6-things-apple-did-not-invent/
What is capacitive touchscreen? In the cell phone industry there are two major categories of touchscreen displays: capacitive touchscreens and resistive touchscreens. Capacitive touchscreen displays rely on the electrical properties of the human body to detect when and where on a display the user touches.
http://www.mobileburn.com/definition.jsp?term=capacitive+touchscreen
Who was first: Apple’s old rival, Microsoft, was the first company to mass produce a tablet computer, with its Microsoft Tablet PC back in 2002. This new class of product ran a specialized version of Windows XP, sometimes converted between a laptop and a tablet with a swiveling screen, and always came with a stylus.
http://www.applegazette.com/feature/6-things-apple-did-not-invent/
The LG KE850, also known as the LG Prada, is a touchscreen mobile phone made by LG Electronics. It was first announced on 12 December 2006. Images of the device appeared on websites such as Engadget Mobile on 15 December 2006. An official press release showing an image of the device appeared on 18 January 2007.
https://en.wikipedia.org/wiki/LG_Prada
Sales started in May 2007. It is the first mobile phone with a capacitive touchscreen. The KE850 sold 1 million units in the first 18 months. A second version of the phone, the LG Prada II (KF900) was announced 13 October 2008.
https://en.wikipedia.org/wiki/LG_Prada
Historians consider the first touch screen to be a capacitive touch screen invented by E.A. Johnson at the Royal Radar Establishment, Malvern, UK, around 1965 - 1967. The inventor published a full description of touch screen technology for air traffic control in an article published in 1968.
https://www.thoughtco.com/who-invented-touch-screen-technology-1992535
Touch Screen Technology - How It Works. The touch sensor is a panel with a touch responsive surface. Systems are built based on different types of sensors: resistive (most common), surface acoustic wave, and capacitive (most smart phones).
https://www.thoughtco.com/who-invented-touch-screen-technology-1992535
IBM’s Simon, released in 1993, was the world’s first real smartphone, running not only mobile phone technology but also an address book, calendar, calculator, email client, fax, games, note pad, and world clock. Remarkably, it also featured a touchscreen, albeit a primitive one by today’s standards.
http://www.applegazette.com/feature/6-things-apple-did-not-invent/
In this post we will tell you some of the touch screen phones before iPhone. Here’s the list of some: Do you know when touch screen phone came into existence in the mobile phone market. Apple’s iPhones or ipads do not deserve the credit for Touch Screen innovations, they only made it Mainstream. The first ancestral touch screen phone was launched in March 1996 by Palm Inc. which later on became part of US Robotics.
http://www.pacebutler.com/blog/touch-screen-phones-before-iphone/
10 years back many companies such as Nokia, LG, Samsung and many more have launched many Touch Screen phones before Apple’s iPhone. Here we will enlighten you some of the Touch Screen Phones Before iPhone: Nokia had developed an iPhone-like device in 2002 that is 6 years before iPhone.
http://www.pacebutler.com/blog/touch-screen-phones-before-iphone/
first capacitive multitouch phone
The first capacitive multi touch phone is KE850.  The first capacitive multitouch phone was KE850.