O2 UK is now offering Research In Motion’s BlackBerry smartphones on a Pay & Go prepaid tariff. The company's Pay & Go deal for BlackBerry smartphones offers customers inclusive BlackBerry Messenger usage and 500MB of monthly data when they top-up with a minimum of £15 per month.

ABI Research says that data usage in Western Europe and North America from 2009 until 2015 is expected to increase at a compound annual growth rate (CAGR) of 42% and 55% respectively.

However, this increase in data traffic is not being matched by a rise in data revenues for network operators. Mobile data revenue is expected to grow at a CAGR of only 18% in North America, restricted in part by the popularity of 'unlimited' or 'fixed price' tariffs.

Orange France has just announced an unlimited mobile phone tariff called Origami Jet. It'll be available from tomorrow and will include:

Three UK is introducing a new tariff that's intended to "challenge and change mobile phone pricing in the UK", according to the network. It's called The One Plan and includes a monthly allowance of two thousand 'any network' minutes, five thousand Three-to-Three minutes, five thousand text messages and 1GB of data for £25 a month as a SIM-only price plan.

Kevin Russell, Three's Chief Executive, said "For individual consumers this plan is about peace of mind.  For the industry it's a game changer. The One Plan is for everyone that wants to get the most from their smartphone and yet keep within their monthly allowance."

With a message of “We thought rationing ended in the 50s”, BT has weighed into the unlimited mobile data debate. It's started offering BT Total Broadband users unlimited access to 1½ million BT FON and BT Openzone WiFi hotspots across the UK. A downloadable mobile application to find these hotspots is also planned.

The company points out that many of its customers are also O2 mobile users "who are about to have their 3G access rationed as they upgrade to new devices".