Normally, when asked for advice on buying a smartphone, I like to lay out the various considerations a buyer should have.
Recently, however, I find myself recommending specifically the iPhone SE along with Consumer Cellular coverage.
That does not mean that an Android phone is not a perfectly fine choice.
The iPhone benefits from recent improvements in navigation and the fact that it is essentially a little iPad when many seniors are now, or will be, using iPads.
The iPhone SE from Consumer Cellular can be had for $170 with a monthly plan of about $25 without being locked in.
The iPhone Is not perfect. Siri voice is not as good as Google Assistant, and the iCloud is not as good as Dropbox, but both Google assistant and Dropbox do run on the iPhone.
If you need a larger phone, the extra cost of such an iPhone may outweigh these benefits.
All this, can change and I will change with it.