Been doing this for upwards of a decade (Mini 2 and now Mini 6). Works great. Buds with Mic for voice calls (not holding it up to an ear), Messages for texting with Apple people, VOIP app for texting with non-Apple people. Nobody on the other end can tell and I appreciate having the bigger screen for all apps.
iPad mini cellular service cost can be as little as $25/year for continuous 5G. Yes, that's
YEAR.
Google Voice is one of
many VOIP apps in the store. I've been using it for the last few years because the "obihai" devices make it possible to use GV with traditional landline setups too. In short: when my iPad "rings" my home phones ring too. When I want to make a GV call, I can do it on my iPad or on my home phones. GV also has a web interface, which makes my Macs "phones" too. GV annual cost for local & long distance for U.S. and Canada: $0/yr.
When I had Comcast Voice service, their VOIP app worked great too. I've also used Talkatone and it is a very capable talk and texting VOIP app too. There are others in the App Store.
For the doubters/denyers, anyone can try VOIP apps on iPhone or any iPad (wifi or cellular) right now. They will generally give you a free number. Text yourself at your current number and vice versa to see texting work. Call yourself and vice versa. iPad mini will "ring" when called. Texting works the same.
If you like it, you can port your number to replace the freebie provided by the VOIP app.
There are not many downsides:
- Obviously not as pocketable
- If you like any Apple device dependent on iPhone (CarPlay, Watch), this requires a hack for CarPlay and perhaps a traditional watch? Or just use your iDevice for watch app functionality... as we all did BEFORE Watch.
- Cameras are superior on deluxe iPhones
- E911 vs. 911 for emergencies
- No "vibrate" mode for incoming call notices.
- While iPad has Apple Pay, pay for things (click/touch to pay) with an iPad is not the same
- No satt emergency option
In turn, iPad tends to not feel "long in tooth" as fast as iPhone, so you can get more years out of one. Cellular costs a LOT less than iPhone. So total cost over time is so much less, you save enough money for other Apple hardware from the pool that would have otherwise been keeping up with iPhone upgrades every few years.
Is this for everyone? No, nothing is for everyone. But- all things considered- iPad Mini can be a great stand in as a cell phone too. The biggest hurdle tends to be a simple one: "think different."
And the proof for anyone interested is only some VOIP app downloads to whatever you have now so you can see and hear for yourself. I encourage anyone remotely interested to download a free VOIP app and simply experience it.
FYI: VOIP apps work on Macs too, so your Mac can be a phone too. Like turning an iDevice into a flashlight with an app, or a tape measure, or a map, or an iPod, Telephony is just another app. I was making a Mac laptop stand in as a mobile phone way back into the early 2000's using Skype's "call mobile or landline" feature. That worked/works just fine too. Various VOIP apps today can make Macs stand in as "phones" too.