Everything! Calls, texts, emails, making notes, social media, taking photos, organisational apps, playing music, checking weather, gps, watching videos, listening to meditations, backup for my computer, checking bus times, making shopping lists. I even use it as a remote for other electronics - not that I have many, as my phone is pretty much everything in one!
Just about everything, to make calls, to connect to social media, do banking, take photos, as a GPS, to send and receive emails and text messages, listen to music, track my fitness, check the weather and so much more. It makes my life so much easier.
I use my telephone to talk and text. Sometimes, I use my Google Translate app when searching for a word during conversations with relatives who don't speak English. Oh, I also use my phone as a calculator and a timer.
Very few phone calls, some texts, the calendar feature and an occasional photo. . . . when I actually remember that it is a camera too! I think the best thing about them is that we can feel safer in our cars - we can contact help and family in an emergency.
I own a 2nd hand $200 Apple phone, & I bought a white leather holder for it, so I can keep my Opal & Myki cards inside the cover. I would make about 1 call a month, if I needed a lift home from the station, & only 1 or 2 people a month send me a text, which I can't read anyway because of my cataracts. We're on a no plan, so I only pay a couple of $'s a month. So it's really just an expensive card holder for 2 cards!! But in March '17 I started using the camera on it, & our eldest granddaughter took 50 selfies, learning how to blow bubble gum! (No I haven't kept all the photos!)