The NHS is to send text messages to 400,000 people, asking them to book a coronavirus jab, with reminders for those who do not come forward.
As part of efforts to boost uptake, text invitations will be sent to those aged 55 and over, with a link to reserve an appointment at a mass vaccination centre or pharmacist.
Health officials stressed that invitation letters would continue to be sent, and that those who preferred not to travel to the sites could wait to be invited by their GP.
But they said the move could allow the programme to move more quickly through the age groups, reacting to changing vaccine supplies and filling empty slots.
Sending texts about appointments is apparently such a new idea that it can only be implemented as part of pandemic measures.