Most of London's wireless hotspots can't support more than one voice-over-IP call at a time, according to a survey by WLAN analysis specialist AirMagnet.
The company surveyed 15 hotspots around Oxford Street and the City last month. It said that 11 of them suffered from coverage problems that prevented multiple simultaneous voice-over-Wi-Fi calls.
AirMagnet boss Ian Schenkel said that without remedial work, people trying to use Wi-Fi or dual-mode phones could suffer dropped or poor quality calls, and might simply give up trying to use it as an alternative to their current phone service.
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He said the most common problem was being on the same channel as a neighbouring network, while other hotspots suffered interference from Bluetooth phones or - especially in sites also serving food - from a microwave oven.
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