The Crown Prosecution Service says its decision to charge two former members of the News of the World editorial staff comes after additional evidence was provided last month.
Earlier in July, the CPS announced six of eight suspects in Operation Pinetree - the investigation into an alleged conspiracy to hack phones at the newspaper - would face no further action.
The remaining two suspects, former features editor Jules Stenson and former deputy editor Neil Wallis, have now been charged with conspiracy to hack phones.
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The A4-sized sketch originally went for £75 when it was first sold.