BBC Radio Leicester reporter Kay Wright wanted her mobile back so much after losing it down the loo she went to the county's sewage works.
Kay visited Severn Trent Water's facility in Wanlip, which serves a population of 500,000.
The company says items which cause many problems for sewage workers include sweet corn, cooking fat and even socks.
Listen to Kay's journey in search of her missing mobile:
Bill Lilly, Severn Trent’s general manager for sewage treatment, said: "Over the years we've had everything from bikes, shopping trolleys, jewellery and even false teeth!
"Believe it or not, sweet corn is our number one item in terms of volume and nuisance factor.
"As well as being tough to digest, the tiny yellow bits are small enough to get flushed down the kitchen sink in restaurants and homes and we reckon we deal with several tonnes of it each year.”
Mr Lilly says sewage workers have had some unusual challenges.
He said: "We do try our best when faced with a challenge of searching for someone’s wedding ring they've dropped down the toilet or plug hole!
"And we've even had instances where we've reunited people with a lost set of dentures!".