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Telefonica UK Limited, more popularly known as O2, is the second biggest mobile service provider in the UK. A subsidiary of the Spanish company Telefonica, O2 currently has a British subscriber base of over 25 million. Founded under the name Cellnet in the year 1985, O2 was purchased by Telefonica in 2006.
O2 offers attractive plans such as the O2 Priority service. This provides discounted prices at certain restaurants and also grants early ticket access for events held at their venues. The O2 custom plans introduced in 2018 allowing users to customize their airtime and device plan is a big hit with users.
O2 was the source of a 24-hour outage across the country in 2012 when one of their network subsystems failed. The company apologized to customers and also offered compensations for the loss of service.
For any issues with services going down or other problems, reach out to the O2 customer support at 8002 from your O2 phone, or at 800-977-7337 from a landline.