Users of the Lifeline service will need to update the SIM cards in any devices that were installed after February last year.
The update is needed to ensure the potentially life saving devices remain compatible, with Sure completing a mobile network upgrade.
The company says it will contact customers by phone or letter to arrange a free home visit, in which a technician will install the new SIM and then test the connection.
Sure said it will gett in contact with customers using Lifeline devices, but added that people can proactively book a slot by calling 700700 or visiting the Sure store in St Peter Port.
The company has confirmed there is no cost for this update, and the process for operating the devices will stay the same too.
For those who also have Sure broadband, the company said it intends to link the Lifeline device to the internet during the visit, to act as a backup.
Mike Fawkner-Corbett, the company’s Head of Consumer, said: “We know how important Lifeline devices are – not just for the people who use them, but for their families too.
“We would encourage all lifeline customers, or their families and carers, to respond when we get in touch and arrange their visit as soon as possible.”
Meanwhile David Inglis, the Chairman of Age Concern, said the charity will help share the message about the upcoming upgrades and changes too.
“The Lifeline service plays a very important role in giving reassurance and independence to the more vulnerable islanders.
“Age Concern are very happy to help support Sure in raising awareness of this upgrade via our Centre Managers who meet every week and who will pass on a message to our service users.”
