02 disruption: What is likely long-term impact?
12 July 2012 Last updated at 10:30 BST
The network problems that hit thousands of O2 customers have continued into a second day.
However the company said its 2G network had now been restored and that customers should now be able to make and receive calls.
Blogger Kat Hanniford of Gizmodo.com discussed the likely long-term impact for 02 and its customers.