Selling your Android phone? Don’t. It keeps your data. | Money CNN

If you recently sold your old Android phone, chances are your text messages, emails, pictures and Facebook key are still in there, even if you wiped its memory clean.

A new study by computer researchers at the University of Cambridge shows that “factory reset” — at least on Android devices — doesn’t actually erase everything.

Sometimes it doesn’t even come close.

The used smartphone market is huge and about 630 million phones out there are susceptible to this problem, according to the study. Wall Street analysts expect the market will keep blowing up in size until at least 2018.

Researchers tested 21 phones made by Google (GOOGL, Tech30), HTC, LG, Motorola (MSI) and Samsung (SSNLF). In every case, they were able to recover text messages, Google account credentials and conversations on messaging apps. A few emails remained on the device 80% of the time.

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Samsung Galaxy Note 4 Review: Far More To Offer Than Apple’s iPhone 6 Plus | Forbes.com

The Samsung Galaxy Note 3 has been my phone of choice for the last year. I’ve used a lot of others, like the LG G3, which I’ve also loved. But I’ve ended up back on the Note 3 every time. That, to me, is the best indication that the Note range is perfectly designed for my needs.

So who should consider a Note 4? Well, my first advice would be that if you have a Note 3, the upgrade is going to be small for you. You’ll get a better screen, nicer design and some nice health and fitness tools, but it’s not a revolution – more an evolution. So those on two-year contracts shouldn’t fret if they’re going to have to stick with the Note 3 for another year.

But for those looking to go down a new route, switch from an iPhone or smaller Android, is the Samsung Galaxy Note 4 worth it?Spoiler: yes, without doubt.

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