- VOIP app delivers the phone and texting options to those not on Apple Tech and I use the same Messages app like iPhone users for those who are Apple people. iPad will ring just like a phone when I'm called. There's lots of good VOIP apps in the App Store.
- Buds with Mic for calls just like iPhone users who want to look at their screen while speaking to someone on the phone. Those on the other end can't tell any difference.
- I chose a cellular iPad because this was a key use intent. Cellular data is relatively dirt cheap. Cell phone bill is averaging $25 PER YEAR. Most of the time, I'm making/receiving calls and/or texts in free wifi zones at home or work. But when I need cellular, I use it just like iPhone users use it.
For my needs, this is ideal and costs nearly nothing. iPads generally last a lot longer before the "long in tooth":"time to buy a new one" effect, so this "upgrade to 6 was from iPad Mini 2 where I did the same thing for many years. My next "phone" will probably be iPad Mini 9 or 10.
Anyone interested but holding doubts about calls, call quality, texting capability, etc can download any of many free VOIP apps on their iPhone or existing iPad. Most will give you a number. Then you can text from that number to your main number and back again and/or call some friends through the VOIP app and have them call you. That test will typically cost $0 so you can see & hear for yourself. If you have an iPad, you can run a very close test to the reality of the experience for me. But you can also test using an iPhone, as it's like using any other app.
Stranger Concept??? Your Mac can be a phone too by the same approach: VOIP app. I was using early Macs as "mobile phone" stand-ins well back into the early 2000s. Skype was one app that allowed calls to/from phones back then. Same thing: nobody could tell that I wasn't using a cell phone for those calls. The big difference is that I had to be in wifi or ethernet wired zones for those calls. iPad with cellular works anywhere an iPhone works.
Telephone and texting functionality is not exactly rocket science apps. In the grand scheme, both are much simpler stuff than many other apps (functionality) in the iOS or Mac stores.