I use Signal for SMS. I have had a message from Virgin which reads "You will no longer be able to send SMS messages from Signal soon. Invite VirginMedia to Signal to keep the conversation here"
I have no idea what this means. Anybody?
Further update: Have received another message (not Virgin) with the same wording. Reading their blog on Signal's Web page it is them that is amending the service shortly which I will try and get my head round. So nothing to do with Virgin, sorry!
Final update: This is nothing to do with Virgin. As I understand it, Signal will be changing from a "message to anyone" service to only being able to message someone who is also using Signal. So you get a message from anyone who messages you who is NOT using Signal to advise them to download Signal in order to be able to continue some time into the future. The change is apparently for "security" reasons. Needless to say, I've stopped using what was an excellent service and returned to my existing default messaging service on my phone.