BT has finally started to get serious about the consumer mobile broadband market after it launched what it claims is the UK's cheapest landline and 3G broadband bundle.

BT is offering an ADSL connection at home, plus a mobile broadband package, for just £15.65 ($22.80) per month.

Over 18 months, the cheapest BT Total Broadband deal, which includes 8Mbit/s wireless broadband at home and 1GB monthly usage for mobile broadband, costs £308.88. That compares to £528.48 with Orange and £435 with Virgin, according to BT's calculations.

The mobile broadband service runs on Vodafone's HSDPA network, which offers 'up to' 7.2Mbit/s speeds and covers 80 percent of the UK. BT said the 1GB monthly data limit is enough to surf the web for 400 minutes, download one film, 48 photos, and 144 songs. Customers who need more than 1GB per month, can pay more to top up their plan.

"This is an absolutely fantastic deal, the most complete home and mobile broadband for only 56p a day is a no-brainer," said John Petter, managing director of BT's Consumer division.

As well as accessing the web via 3G, BT Total Broadband customers can use its network of wireless hotspots to get online when on the move. BT has partnered with Fon to give customers access to 400,000 hotspots around the world, and Starbucks to provide a free internet connection at 650 coffee shops in the UK and Ireland.