Grumpy I bank online, have done since it was first introduced, and shop online as well, but I don't need a smartphone to do any of those things. My Mum does have a smartphone, but it is only switched on when she wants to use it, and she has no idea how to text..despite her three adult grandsons showing her frequently. She has an iPad, and can face time those who use Apple (we don't), but she refuses point blank to do online banking, or to use Amazon. If she wants something I order it and pay, and as I am now back in UK, she writes me a cheque to pay for it.
She emails her friends, or calls them on the landline. I wouldn't say she is isolated. Db and I have both been living abroad for years, so she is pretty resilient anyway.
She doesn't use the internet for her TV either, and as she is only spending on her food shop, which I pay for and then she writes me a cheque when I drop it off, no need to do much banking anyway!!
I am not sure not using tech makes one isolated. There are print newspapers, the news on TV, the radio, the landlines next, even the post...I've been sending cards to friends abroad so they don't feel forgotten. Tech is a means to an end, not an end in itself; use it if you feel it adds value, but you don't have to if it doesn't. My late grandmother who died in 2006 at 93, never had a TV, only got a landline in the 80s, and never, ever had a mobile or computer. Some people just don't want or need it.