Jamster will launch a mobile entertainment portal customised for the iPhone on Friday, coinciding with the device’s arrival in the UK and Germany. The Jamba alter ego says it will offer music, music videos, comedy vids, movie trailers, clips from season four of 24 and games via jamster.co.uk. It’s a web-based portal so, in theory, it could be accessed by users of any handset (as I have just done with my Nokia (NYSE: NOK) E61), but, if it comes with custom iPhone tweaks, it will be amongst the first content plays specific to Apple’s (NSDQ: AAPL) gadget from the Crazy Frog creator.