Taiwanese production plant Pegatron Technology has reportedly received a manufacturing order from Apple for 15 million iPhone 5s. The plant, which is best known for building notebooks, was a major supplier of iPhone 4s, and if sources are to be believed, production is on schedule for a September launch.

The same sources also re-affirm rumours that the forthcoming iPhone 5 with be more like an iPhone 4S - it will be a fractional update on the iPhone 4, possibly with a new case design (and, obviously, sporting iOS 5), but with few other surprises in its bowels.

Pegatron Technology formerly supplied four million CDMA iPhone 4s, so it has been working with Apple for a while, but if this new report is true, this is the largest volume of handsets it has ever been commissioned to build.

The company itself declined to comment about its partnership with Apple, or its involvement with the iPhone 5.