We fight against loneliness among the people with dementia and created https://www.grandtime.app/ GrandTime is a video call and messaging solution designed especially for the elderly.
The elderly don’t need to have experience with smartphones or tablets. The solution is really simple and suits also well for people with dementia, Parkinson's Disease and other cognitive disorders. To use the application you don’t need SIMcard or the number from telecom, just plain internet. The video and messaging is between two phones. You can download it from here.