Linked to a series of low-powered radio stations, the mobile telephone enabled its user to make a call at any time or place, even from a moving car. Different frequencies were used to avoid interference between phones. The image that summed up the go-getting, get-rich-quick attitude of the 1980s (and, more recently and locally, the Celtic Tiger of the 1990s) was the mobile phone. Studies have shown that using mobile phones increases the risk of cancer.