I wouldn't want to exist without my phone. I use it every hour of every day for something.
The camera is superb as I can record anything that happens that might be important later or that I might have to remember later. Similarly, instead of writing things on bits of paper that generally get lost I tap it into a note on the phone (Evernote) and it is then permanently there or I will use the voice recorder and make verbal notes.
I use a password app (RoboForm... used to use LastPass) so that all my passwords are safely stored in one place and encrypted to prevent them being stolen and also it means all my passwords are also available on the desktop/laptop instantly available. This has a knock on benefit in that it means using complex passwords is easier as I never have to remember them so my banking and other secure apps are much more secure. I can easily change them and record the change much more often... again good for security. In contrast, my mum has a book with all her passwords... insecure and she forgets to write them down or, in one case, lost the book in house move!
My diary is on Google and so is my wife's and we link them together so that we can both see each others diary in real time which makes making appointments easy. Moreover, again, back to not needing paper, if I make an appointment for anything (dentist, doctor etc) it goes into the diary at the time I make it guaranteeing it is properly recorded and also my wife can see immediately so no risk of double booking. The calendar also allows me to set up notifications and alarms so I am less likely to miss appointments. It makes planning future activities easier too.
Oh, BTW, it also makes telephone calls (!) and as we now have decided not to have a landline it is great because all our in and out calls are recorded (the numbers, not the conversations!!!).
I could go on and on... you'll be pleased that I won't... but it is the tool I use every day to make my life easier and yes, of course I can live without it but I certainly wouldn't want to.
Of course, all of this is only going to work where there is a data service available on the mobile network or wifi but that is getting better all the time and eventually it will just be everywhere no matter where you are.
We cannot possible manage without a landline, though, because we have no mobile signal, and aren't like to get one. Most of the things you do with a phone we do with an iPad, desktop or laptop. Having been a Microsoft Office user for decades (used it at work), I still do everything in Office, so diary, notes, finance, pretty much everything. I'm used to using a proper camera, and that's got wifi, so it just sends photos direct to the NAS when within wifi range, so we can easily access them on any device.
99.99% of the phone calls I make or receive are at home, where the mobile doesn't work (so stays switched off). There is no prospect of us getting a mobile signal here in my lifetime, I think. We have a small community group that looked at setting up a microcell just before the pandemic, but the cost was very high, even though a farmer offered the use of his land free of charge. Same goes for several other villages around here, several have no signal and some have tried to get it sorted, but I don't think any have succeeded. Mobile coverage here is hampered by the area being dominated by EE, with all their masts working at the higher frequencies, so the signal just doesn't make it to the bottom of the valleys. The builders that came over here from Ireland to build our house couldn't believe that their phones didn't work, either here, or in the village a few miles away where they were staying. Until you've lived in an area where reception is patchy to non-existent I don't think it's easy to understand what it's like.
All the big networks, and many of the smaller MVNOs, support WiFi calling. That allows you to make and receive calls and texts anywhere you have WiFi, even if you have no mobile signal. On iPhone, Settings - Phone - WiFi calling. On Android, Phone app - 3 dots top right - Settings - WiFi calling. If you don't see the option then it isn't supported by your phone or network.
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I know, but only if you fork out for a plan that supports it. Because I so rarely have a need to use the mobile, I have a cheap PAYG SIM, and that works fine, costs next to nothing, but it doesn't support wifi calling. That's no bother at all, as the landline works perfectly for calls, and I can't see the point of keeping a mobile on, and keep charging it all the time, when the landline just works without any of that.