Apple is reportedly testing a new, larger iPad and iPhone ahead of its autumn product announcements.

A report in the Wall Street Journal says that the company is trialling a 13-inch version of its tablet computer with selected manufacturing partners.

If confirmed, and actually released, a larger iPad would be a surprising shift in the formula for Apple's tablet computers.

The iPad has always had a maximum 9.7-inch screen, with the iPad Mini, released last year, coming in at 7.9 inches.

Again according to the Journal, Apple is also said to be experimenting with prototypes for iPhones with larger screens than the 4-inches currently used in the iPhone 5.

It is thought the new size may be between 4.7 and 5.7 inches, which would correspond to a report by Reuters last month on the supposed 'cheap' multi-coloured iPhone due later this year.

However the WSJ report makes clear that none of the rumours are confirmed, and it is normal practice for Apple to test devices that are never released to a mass audience.

Apple, naturally, did not comment. But for some experts, while Apple has made its name on consistently releasing just a few, honed products the future is likely in developing a Samsung-like range of devices, to suit any need.

"In the long run, we will see touch screens in all sizes as the future vision of the technology industry is to offer the same user experience across all screens," IDC analyst Helen Chiang told the WSJ.

"The key is to bring down the cost and introduce compelling applications for large-screen devices."

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  • Steve Jobs "Crazy Ones"

    This never before aired version of the "Crazy Ones" <a href="http://www.huffingtonpost.com/2011/10/06/steve-jobs-think-different_n_998003.html?ncid=edlinkusaolp00000003" target="_hplink">commercial is narrated by Steve Jobs</a>.

  • Henry Ford

    Print ad from 1981 foreshadowing Apple's use of famous historical figures in their 1990s "Think Different" campaign.

  • "A Is For Apple"

    Print ad from 1977, prior to the launch of Apple's Macintosh.

  • "1984"

    This now critically acclaimed commercial by Ridley Scott, which aired on January 22, 1984 during Super Bowl XVIII, was the world's introduction to the Apple Macintosh Personal Computer.

  • "Introducing Macintosh"

    Print ad from April 1984 explaining the inner workings of the Macintosh.

  • "Lemmings"

    This 1985 commercial was a less successful follow up to "1984." It first aired during Super Bowl XVIV

  • "The Computer For The Rest Of Us"

    "The computer for the rest of us" campaign of the late 1980s continued to build on Apple's brand "by portraying the Mac as embodying the values of righteous outsiderism and rebellion against injustice," <a href="http://www.wired.com/gadgets/mac/commentary/cultofmac/2002/12/56677" target="_hplink">wrote <em>Los Angeles Times</em> columnist Charles Pillar</a>.

  • "Who Needs A Computer Anyway?"

    Little known circa 1989 Apple campaign featuring cartoons from <em>The Simpsons</em> creator Matt Groening.

  • "What's On Your Powerbook?"

    This early 1990s campaign continued to emphasize individuality by having seeming opposites in the same ad both using a Powerbook.

  • "Crazy Ones"

    This ad featuring narration from actor Richard Dreyfuss first aired in 1997 in conjunction with Apple's "Think Different" print campaign.

  • "Think Different"

    This campaign launched September 28th, 1997 and featured photos of visionaries, thinkers, leaders, artists and inventors including Albert Einstein, Bob Dylan, Martin Luther King, Jr., John Lennon, Martha Graham, Muhammad Ali, Alfred Hitchcock, Mahatma Gandhi, Jim Henson, Maria Callas, Picasso and others.

  • iMac Colors

    iMac print ad from the late 1990s.

  • "Switch"

    This campaign launched June 10th, 2002 intended to get people to "switch" to Apple by featuring a series of "real people" explaining they preferred their Mac over PCs.

  • "Get A Mac"

    This is the first ad from the now famous "Get a Mac" campaign. <a href="http://www.adweek.com/adfreak/apples-get-mac-complete-campaign-130552?page=1" target="_hplink">It first aired in May 2006.</a>

  • "Thanks A Billion"

    iPhone print ad from 2009.

  • "Get A Mac"

    A "Get A Mac" spot from October 2009.

  • "Facetime"

    This commercial from 2010 accompanied the launch of iPhone 4 and Facetime, allowing users to video chat from practically anywhere.