The most likely release date for the iPhone 6S is September 2015, which would follow Apple's iPhone release schedule history. The iPhone 6 and 6 Plus were released in September 2014, the iPhone 5S and iPhone 5C in September 2013, the iPhone 5 in September 2012 and the iPhone 4S in October 2011.
However, it's possible that Apple will choose to begin releasing new smartphones twice a year, to keep up with the ever growing and improving competition from rivals such as Samsung, HTC, LG, Sony and more.
In fact, the latest rumour (albeit a particularly shaky one), suggests that the iPhone 6S could arrive in spring 2015 alongside the Apple Watch, which is also expected around that time.
That rumour comes from Stabley Times, which claims: "Our source says that Apple is hesitant about launching the iWatch [sic] in the spring of 2015 without a new iPhone to go along with it, as it could give hesitant consumers an excuse to wait on buying both until the fall."
Note that the report calls the Apple Watch the 'iWatch', a name that was widely rumoured for Apple's smartwatch but wasn't used by the company.
The report goes on to suggest that the iPhone 7 (which we assume would be the successor to the iPhone 6 Plus), is the smartphone that'll launch in September 2015. Unless, of course, it launches in spring 2016. (We did warn you that the rumour might not be completely reliable).
Despite the sketchy nature of the report, it's not completely incomprehensible that Apple would launch a new iPhone alongside the Apple Watch next year, but it does seem much less likely than a September launch to us.
However, a report that emerged in early December, however, seems to dismiss the idea that the iPhone 6S will arrive in spring 2015. Economic Daily News reports that, while the Apple Watch is still likely to arrive in Spring, the iPhone 6S's A9 chip (which you can find out more about later in this article) has not yet entered mass production, which suggests that a Spring launch is off the cards after all.
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