CUSTOMERS are being warned that a long-running service ends tomorrow.

The move will leave some users with no data to go online and check apps such as WhatsApp or Instagram.

The only way some O2 customers in parts of the UK will be able to have a normal service is if they have an up-to-date device or are connected to Wi-Fi.

Together with EE, Three and Vodaphone, O2 is one of the big four networks and the last to ditch its 3G service .

O2 customers have been warned for months that the shutdown is coming to some areas of the country tomorrow, Wednesday September 17.

After more than 20 years, the companies are phasing out 3G, which was a game-changer for smartphones when it was introduced in the UK in 20023. O2 offers huge speed boost at 22 sites across UK in major upgrade

It brought

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