Door-to-door phone buyers, and the personal data left behind📱

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Despite the sheer number of brands and falling prices, buying up damaged phones is still a going concern. But behind this local economy lies a technological risk few sellers seem to grasp: their personal data could resurface.

When the motherboard still talks 💾

You are at home when strangers knock on your door. Others announce by loudspeaker that they buy phones that are already damaged. Plenty of residents take them up on it to make a little extra money. But this habit can carry consequences many people overlook.

Once collected, the phones are recycled and, as the saying goes, nothing is lost, everything is transformed. Yet the storage chips on the motherboard may retain traces of what the phone once held. With specialized software and a bit of patience, some people could use them to reconstruct events or recover data. The process is complex, but not impossible. A second-hand phone seller at a market in Yaoundé, Cameroon’s capital, puts it this way:

“Sometimes a customer comes back with a fault, and while repairing it we stumble on photos and messages the previous owner thought had been erased long ago.”

Information you thought was gone ⚠️

It would therefore be possible to recover information you believed had been deleted years ago: photos, conversations, contacts, access to accounts. The consequences can be severe: blackmail, identity theft, cyberbullying. Once in the wrong hands, this data can spread, and there is no calling it back.

A former customer recounts: “I sold my old phone without a second thought. Months later, a stranger messaged me with one of my private photos. Since then, I never sell anything without taking precautions.”

How to protect yourself 🔐

Before any sale, back up your data, sign out of your accounts, remove the SIM and memory cards, then carefully reset the device. On older models, a simple reset may leave traces, which is why it is worth encrypting the phone first. If you would rather not take that risk, skip the sale and destroy the phone before throwing it away, so you don’t expose yourself to cyberbullying down the line.

Sell with caution 🛡️

Selling a phone brings in a little money, but the device you hand over can do serious damage to its former owner’s life. Sellers should therefore insist on removing the motherboard from their phone, so as not to hand their personal data to strangers.

In an age when our phones hold our entire lives, a device’s real value isn’t its resale price but what it knows about us. Selling one without wiping it is handing the keys to your private life to a stranger.

Have you ever sold or thrown away an old phone without wiping it? Tell us in the comments how you protect your data!