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Of the approximately 87 million mobile phones in the UK, the alert will only appear on smartphones on 4G or 5G networks.

In 2021, three mobile phone networks agreed a deal to build and share masts to improve 4G in rural parts of Northern Ireland.

Freshwave will also collaborate with the MNOs on new 4G and 5G infrastructure at 12 of the biggest Network Rail stations including Birmingham New Street, Bristol Temple Meads and Edinburgh Waverley.

Network Rail, which is owned by the government, has signed a deal with two private telecoms firms in a move it claims will see 4G and 5G connectivity boosted on trains and in stations.

On Monday, the Treasury also confirmed proposals to reduce the maximum amount of sugar allowed in drinks before they become subject to the levy from 5g to 4g per 100ml.