Barclays introduces person-to-person mobile money transfers to the UK, Ofcom gets the go-ahead to cut wholesale interconnection charges, a handful of new phones are announced ahead of Mobile World Congress... plus the rest of the week's big news.

Online travel retailer redspottedhanky.com has introduced a UK train ticket service for mobile phone users.

The mobile application, which was developed by m-ticket company Masabi, allows customers to search for and buy train tickets without paying any booking fees. In addition, users will also earn loyalty points from redspottedhanky.com.

Research In Motion is releasing version 2.0 of its BlackBerry PlayBook operating system today.

PlayBook OS 2.0 was originally due to be released last year.

Everything Everywhere, which runs the UK networks of T-Mobile and Orange, has announced its financial results for the final quarter and full year of 2011.

It says service revenue was up 2.1% if the effects of Mobile Termination Rate cuts are ignored - or down 2.1% when the impact of MTR cuts is included.

Geoff Varrall of RTT writes:

About 15,000 years ago some indigenous Northern Australians decided that they needed a more efficient way of talking to each other than just shouting a lot.

And blowing into a long cylindrical tube proved to be just what was needed and seriously useful fun – the dawn of the didgeridoo.

Trumpets and bagpipes were invented at about the same time. The ancient Greeks used the trumpet in battlefield communication to devastating effect.

The way you can tell that your didgeridoo is better than everyone else’s didgeridoo is to blow into it and see how far the sound goes.