I don't know about phoning old JW friends... but I've thought about sending an 'I'm thinking of you' type of card.
I even bought the card a couple of years ago. It still sits on a shelf... waiting for me to get the time/nerve up to send it.
I figure that I will someday... and I suppose that I will put my phone number, and address in it.
The only reason that I hesitate is that I know that they will misunderstand the card as a 'reaching out' trying to get 'back in' to the borg... which I have no interest in doing.
...and so, the card sits and collects dust.
Regards,
Jim TX