Sure has warned customers they may face some disruption during the early hours of Monday morning, as it rolls out the latest updates in preparation for 5G.
A Sure spokesperson said some customers could experience “temporary interruptions to mobile services, including making and receiving calls”.
However, it assured the public that emergency calls would not be affected.
The network upgrade comes as Sure reached a “major milestone” in its 5G rollout programme this week.
Starting on Thursday and then running in phases until 14 August, the programme is a key part of its mobile network transformation.
For customers, this programme will mean stronger mobile coverage, improved network performance, greater network capacity and the phased introduction of 5G later this year, Sure said.
Alistair Beak, Group CEO of Sure, said: “Our customers expect to stay connected wherever they are and whatever they’re doing - whether that’s working, learning, streaming or keeping in touch with family and friends.”
“This programme is all about delivering that experience, creating a stronger, more resilient network that keeps pace with the way people live today and into the future.”
Mr Beak added: “We appreciate our customers’ patience as we complete this important stage of the programme. Although some customers may experience brief disruption during the migration, this investment is a vital step towards delivering a significantly better-connected experience for years to come.”
The introduction of 5G will enable customers to benefit from faster speeds, lower latency and increased network capacity, helping to support growing demand for mobile data and future digital services across the islands.
Most customers should see little to no disruption, with the main works taking place in the early hours of 13 July.
