Nokia is reported to be "facing a new fight" as counterfeit manufacturers have upped the quality of their replica devices.
Mobile Today reports that distributors and dealers who have seen the latest fakes have "raised their concerns about the difficulty of telling them apart from the originals".
The most recent fakes reported are the £700 Nokia Arte Sapphire and the new £500 Nokia N96 which, according to Mobile's sources, are "flooding the market".
One retailer is quoted as saying: "The fakes are amazing - there is no way I could tell they are not real and I have been in this industry for 10 years. The menu systems are identical, and they have the same ringtones".
Nokia MD Simon Ainslie told Mobile: "We take [counterfeit products] very seriously. Copied phones still exist and our intellectual property team are always investigating them".