Mobile phone operator Orange will decide by the end of April whether to reduce the amount it charges for donations to charity by text.
Rival operators Vodafone and O2 have reduced their charges on text donations so that 90 per cent of the value of donations goes to the charity.
Orange has declined to reveal how much money reaches charity out of every text message donation made by its customers, but the firm is in talks about reducing its charge.
A coalition of the Charities Aid Foundation, the Institute of Fundraising and a number of charities has been lobbying for cuts in mobile phone operators' fees.
It plans to publish a league table that will set out how much each operator charges per donation and could be used by charities to discourage supporters from donating by text message if they used the higher-charging operators.
One member of the coalition, who asked not to be named, said it would wait until Orange delivered its verdict before publishing the league table, because otherwise the table could be out of date quickly.
An Orange spokesman said: "We have competitive rates. We are reviewing our rates, as we do every year."