Vodafone has begun shutting down its Sure Signal service, potentially leaving thousands of users in areas with limited or no mobile coverage disconnected.
Introduced in 2011 as a 3G mobile booster, Sure Signal has reached the end of its life, with the technology no longer supported by the vendor.
Vodafone began switching off Sure Signal yesterday, and the process is expected to be completed in a few days.
There are approximately 8000 Sure Signal customers, though the number has steadily declined as people upgrade to newer technology, Vodafone say.