This was the era of the iPhone 5 and Android KitKat. BlackBerry was trying to have (yet another) resurgence and Nokia was desperately trying to keep Windows Phone alive. What advice did I give then, and is it still relevant?
In at number five is just stay sceptical. I mean, quite often, lots of mobile viruses and mobile scams spread by text message, by email, by Twitter. And these are all things that we get on our phone. But for some reason, because they seem to come from people we trust, all of our savvy just goes out the window. When you see a message from someone which purports to be your friend, just think, does this sound like them? Is what they're asking me to do a rational thing to do? And when you go and click on a link that someone has sent, check to see if it's actually taking you to where you expect to go.
Still entirely relevant, sadly. You've probably received an SMS saying "Mum, I've dropped my phone. This is my temporary number." Or accidentally clicked on an advert which prompts you to hand over your credentials.