By John Leyden
4th May 2009 12:02 GMT

A TV investigation has revealed that secondhand BlackBerries on Nigerian markets are priced according to the data held on them, not the age or the model of a phone. Jon Godfrey, director of Sims LifeCycle Services, who is advising on a TV investigation into the trade due to screen later this year, said that BlackBerries sell for between $25 to $65 on Lagos markets.

Details of the trade come from an agent in Nigeria unaffiliated to Sims' technology recycling business. Godfrey explained that the smart phones offered for sale come from the US, continental Europe and the UK. "It's unclear as yet whether the phones are either sold, thrown away, lost or stolen," Godfrey explained. Other type of smartphone are also of potential interest to data thieves, but it is the trade in Blackberries that seems to be the most active.

Data retrieved from smartphones is itself traded by crooks in Nigeria. BlackBerries include technology to remotely wipe devices and come with built-in encryption. But this encryption is often left switched off because it is considered an inconvenience. "Business critical data is left on unprotected devices," Godfrey explained. "Anyone who gets these devices will obtain a snapshot of someone's life."

"People need to take residual data issues more seriously and have a policy on how to use and dispose of devices," he added. According to a survey by endpoint security firm Credant Technologies, four in five mobile phone users store information on their phones that might easily be used to steal their identities. A survey of 600 commuters at London railway stations revealed that 16 per cent kept their bank account details saved on their mobiles, while 24 per cent also saved their PIN numbers and passwords in the same insecure manner.