At the start of lockdown last year I put a SIM into an old iPhone we had and gave it to mum and dad so we could video chat on Whatsapp. They have never had a computer or a smartphone and it was a nightmare. Every time it went wrong I had to try to troubleshoot over the landline - and this is with people who literally don't know what a 'Home' key is. The phone completely died after about two months and we all gave up.
We've been managing with phone calls, but it would be really nice to be able to speak face to face, even after lockdown ends.
Is there anything we could use for just video chatting, it would need to have a SIM data plan as they don't have any internet hooked up at all. They really don't cope well with technology, they both have the most basic possible mobiles without touchscreens and even those are a bit beyond them.