We talk a lot about new apps, and often recommend a whole series of apps on a theme in our roundups. But what doesn’t often get a mention are the apps so popular that they almost become part of the background.

So here’s an ode to three huge apps that may have passed you by. Ultra-popular services can be overwhelming if you’ve not used them before, and even veteran users sometimes miss out on features when there’s so much crammed into a single app.

So let’s take a quick look at three apps you really should give a try if you haven’t already – all three are free so there’s no reason not to dive on in!

WhatsApp

WhatsApp is a popular internet messaging service used around the world as an alternative to text messages, phone calls and more. If you’re not familiar with the app, it’s like iMessage but not exclusive to Apple devices, or like text messaging without eating into your cell plan. More than a billion devices worldwide use it!

Read our guide to messaging with Whatsapp

Get WhatsApp

Instagram

The social network based entirely on sharing photographs isn’t just the home of camera geeks and selfie queens. Instagram is a welcoming and inspiring feed of visual content and a great way to share and document experiences with friends. In recent years, it’s become less of a photo feed and finally feels more like a community.

Get acquainted with Instagram with our guide

Get Instagram

eBay

Founded in 1995, eBay subsequently grew to become a colossal online auction and shopping website. For sellers, it’s a place where the sheer number of users massively increases the chances of a sale. And for buyers, the likelihood of finding rarities and bargains is high. Naturally, you can do everything on eBay using an iPhone or iPad, and these guides will show you how to do it all.

Guide part 1: searching and buying on eBay

Guide part 2: selling your stuff on eBay

Get eBay