This is the end of an era but no arts project should stand still and we are now looking forward to developing the prize with a new partner. -- Kate Mosse Orange Prize co-founder
From the BBC
The mobile services company, which has sponsored the prize since it was established 17 years ago, is to focus its brand on the film industry.
Novelist Kate Mosse, the prize's honorary director, said she was in "active discussions with a number of potential new sponsors".
The £30,000 prize recognises English language fiction written by women.
The announcement comes a week before the winner of this year's Orange Prize is to be announced in London.
Mosse, who co-founded the prize in 1996, said: "Our partnership has delivered everything - and more - than we hoped for. A celebration of international writing by women, one of the most significant arts awards in the UK and also a major force in education, literacy and research.
"This is the end of an era but no arts project should stand still and we are now looking forward to developing the prize with a new partner," she said.
She added: "These are very challenging but also exciting times in publishing and we hope that the Prize for Fiction will continue to make as significant a contribution going forward as it has over the last 17 years. To that end, we are in active discussions with a number of potential new sponsors and look forward to the start of another exciting chapter for the prize."
In an open letter on the Orange Prize website, Mosse invites potential sponsors to get in contact.