The US cellular operator Leap Wireless International is planning to introduce a USD40 a month unlimited mobile broadband service across its entire service area by the end of this year, Fierce Wireless reports. The service, which will use Leap’s EV-DO Rev A high speed data network, will allow Windows-based PCs and portable devices to connect via a USB modem. It is being marketed as an alternative to wired broadband systems such as DSL and cable. Leap Wireless had 3.3 million subscribers at the end of June 2008, of which 14,000 were wireless broadband customers. It is hoping to sign 100,000 data users by the end of this year.