ChildLine, which has been facing a financial crisis and possible redundancies, has been made the official charity of Blue Peter's annual Treasure Trail Appeal.
Viewers will be urged to search out old or foreign coins and unwanted mobile phones to raise funds so the charity can answer more calls.
Each phone, recycled by ShP Solutions Ltd, will bring in £3 for the charity - the cost of a call to ChildLine - and a cupful of unwanted coins has an estimated worth of £24.
The appeal is calling on people to give enough "treasure" to fund at least 5,000 more calls for the charity, which would cost an estimated £15,000.
At the end of a difficult year for the charity, the appeal will give it a much-needed boost.
Apart from the money it will bring in, said ChildLine founder Esther Rantzen, the Blue Peter appeal would be a fantastic way to reach children in need of the services.
Richard Marson, editor of Blue Peter, said: "Our viewers always rise to the occasion when it comes to helping others, and we're hoping this will be no exception."