Amazon is offering tech-savvy customers first dibs of the new iPhone 15 in all of its colour and size variations with a pre-order function before releasing to the public officially on September 22. Apple unveiled the new 15th generation iPhone with a titanium case and faster chip that enables better cameras and mobile gaming – moves designed to respond to a global smartphone slump. The new line-up includes iPhone 15 starting at $US799 ($A1244 although Apple says it will cost from $A1499 in Australia) and iPhone 15 Plus starting at $US899 ($A1399). Catch the best deals and products hand-picked by…