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BT Fusion Wi-Fi for business allows customers to make inexpensive VoIP calls when they're within range of a Wi-Fi connection (either a public hotspot or in their own office), reverting to normal GSM mobile calls when out of Wi-Fi range. BT has been offering Fusion to its home customers for over a year, but says it's now time for SMEs to benefit from the service.

BT says mobile workers will benefit from its investment in Wi-Fi infrastructure. "Customers will be able to use their phone in the 2,000 BT Openzone hotspots in the UK. And in every one

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of those 12 wireless cities that we're putting up, you'll be able to use your handset," said Bill Murphy, managing director of BT Business at a briefing in London today.

The company claims the handover from GSM to Wi-Fi is flawless and invisible to the end user. To illustrate the point, a BT spokesman claimed one of the company's own executives was on a continuous conference call from Heathrow Airport to the City, that passed through six different handovers with no drop-out or adverse effect on call quality.

The service will launch with just two handsets - the Nokia 6136 and Motorola A910 - with Samsung's P200 being added to the list next year. Prices start from £15 a month, including the handset, with calls to mobile phones capped at 25p for up to 60 minutes.

The company today also launched two more SME services. BT Workspace is a hosted collaboration and project management service, based on Microsoft's Sharepoint. BT has also introduced an online PC backup service, with prices starting from £5.95 for 1GB of storage.