It's a phablet
There’s no mystery about the fact that the iPhone 6 is going to be bigger. Just how much bigger remains open for debate, but most sources suggest Apple plans to release the iPhone 6 in two sizes: a 4.7-inch model and a larger 5.5-inch unit.
Both would be considerably larger than any previous iPhone. The reason is obvious: With high-end Android smartphones getting bigger every year, Apple needs to compete in order to avoid losing customers who think a 4-inch display just isn’t big enough to do everything they want.
Rumors of a phablet-size iPhone 6 date back all the way to early 2013, with the (incorrect) suggestion that Apple planned to release the iPhone 5s side-by-side with a larger, 5-inch iPhone 6.
In September 2013, the Wall Street Journal reported that Apple was experimenting “with screens ranging from 4.8 inches to as high as 6 inches.” Analysts picked up the news, too. By early this year, the sizes seemed more or less confirmed — although reported production problems with the larger iPhone 6 might delay that model beyond September's supposed launch date.