Being single, I make it clear I am happy to get comms by phone. I have regular text and WhatsApp contact with my regulars, but I leave it to them to initiate. Some are more than happy but I do not text unsolicited.
One of my regulars texts every day and once, when I went to a meeting and had no service for 6 hours, eventually got hold of her only to find she was on her way over to my house to check I was OK. Before anyone things that would be indiscreet, she often pops in for a coffee when in the area.