I think the problem that carriers are having with the iPhone is Apple's wholesale rate for the handsets. In the UK the iPhone tariffs are the same as the tariffs for other handsets.

The introduction of the 3GS in the UK saw O2 effectively increase the price on the handset. Looking at the Pay As You Go price of the iPhone shows that the handset is not that competitively priced against unlocked version of rival phones. This all points to the Apple wholesale rate being more than other handsets.

An influx of new subscribers all getting a bigger subsidy than other handsets would effect the ARPU for certain carriers.

The BBC are working on different versions of iPlayer for different devices. The iPlayer is a catchup TV service that requires DRM so that the content is only used within the terms of service. Since Apple are unlikely to licence the iTunes DRM this is probably going to be a streaming service rather that a DRM download service. This is the quickest way that the BBC can bring iPlay to Mac's, Linux and other devices such as the iPhone.