Selling an old phone- how safe is a factory reset?

As in title really; I have several old phones in a drawer that I’d move on if I could be sure would be safe, as it were. Ive used them for all sorts of financial stuff as well as FB, whatsapp and so on. What is the best way to make them safe to sell on?

What is the best way to make them safe to sell on?

Do a factory reset.

Make sure you unlink any MFA sign ins/apps or device location bits & bobs from the device too.

Technically it may be possible to retrieve some data depending on, well, a bunch of factors. But it would be very difficult and probably very expensive, it would be beyond my means. The reality is that no-one’s going to bother with a decade-old phone that’s going to be given to their kid. If you were someone likely to be targeted by nation state actors headed up by a bald despot then I might be more nervous.

TL;DR – factory reset it, you’ll be fine.

Cheers folks 🙂

Unless you work for MI5 or MI6 I wouldn’t worry