How annoying is this? From ZDNet: Think factory reset wipes your data from Android phones? Think again.
Diligent Android users may have done the right thing and factory reset their devices before selling them, but researchers have shown personal information can still be recovered from dozens of devices, even after they’ve been wiped.
As many as 500 million smartphones running older versions of Android may still be carrying data including Google and Facebook account details, SMS and email content that users would likely assume would be deleted from their devices after a factory reset. [continue]
This is one reason that I won’t be selling my old phone.