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Frank wrote

Or maybe you know a "local" second-hand shop. For a specific phone (one among dozens and dozens of models that would work), try to find a new or refurbished "Samsung Galaxy S8" (about $85 should do it). I have one myself that I keep continually charged to serve as a secondary internet device and as an alarm clock in a convenient spot in my apartment. It does not have cell phone service! It does run hundreds of useful apps including amazing tools for astronomy, celestial navigation, and more.

Interesting comments. I have an S8 and by the end of the year I will be forced to make a big decision - either buy a new (cheap) phone or do away with voice and use the device as a "supercomputer" that connects to the internet via wifi, has gnss and runs lots of apps. I rarely use voice and the app I use to communicate with family has voice should I want to speak to them.

The s8 was advertised as a 4g capable phone. Therefore when the mobile company announced that it was closing down the 3g network the end of the year I was not concerned. However after some research I disovered that the s8 is 4g for data but only 3g for voice. When the s8 was introduced I suspect that a sales point would have been 4g.  Maybe I will wait until the 3g newwork is switched off and confirm that voice has stopped working.

David C