CCTV footage shows Laura Safe, 27 - who joked that she should change her name to Unsafe - plunging into the icy water of the canal in Birmingham.
She was so engrossed in chatting with her boyfriend she walked straight into a canal, and the hilarious episode was captured on camera.
A passing businessman is seen trying to warn Miss Safe to look out, but by the time she takes her eyes off her phone, it is too late.
The heroic passer-by, 34-year-old Neil Edginton, rushed to Miss Safe's aid as she flailed about in the water, watched by open-mouthed diners at the city's Mailbox complex.
The Capital FM Breakfast Show newsreader emerged unharmed and merely embarrassed at falling into the water in front of so many onlookers.
'I thought ice on the canal was pavement because it looked dark in the corner of my eye,' the newsreader said.
'I heard a man called out "stop" to me and I looked up at him, but it was too late by that point.
'I tried to get my balance and ended up slipping into the canal. But not before I'd saved my handbag and mobile phone.'