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Hundreds of thousands of new cell phones are sold every year. Most of them go to replace older phones, which can end up being donated, refurbished and resold, thereby keeping them out of landfills and extending their life cycles.

But now comes word that, in a study of 2,000 recycled phones, a shocking 99% of them still had some amount of private data stored in their memory. This even included personal data like passwords and private emails, according to Regenersis, the UK-based cell phone recycler, which conducted the random test on the phones it was recycling.

Now, if your cell phone is a golden oldie like mine, there's probably not a lot of data on it. But if you're been migrating to smarter phones, or if you use yours for any type of online services, this could be more of a problem in the long run.

There are a few steps you can do to help ensure that your data is safe when you donate or recycle your phone:

1. Remove the SIM card. (This contains a good chunk of your private data.)

2. Take the time to clear your memory of your contacts, bookmarks, photos and other data.

3. Reformat your cell phone yourself, wiping out all of the old data in the process.

4. Confirm that the company recycling your phone wipes out all data, and does it well. (I think it's important to note here that Regenersis does not seem to be one of those companies that wipes phones clean. They rely on the people doing the donating to do that, which is kind of weak.)

Here's an earlier post that offers more tips on recycling your old phones.