There's never been a better time to be with O2 !
Unlike other networks they value the existing customer, rather than just the new ones. Hence you will find the largest range of O2 mobile phones at the cheapest possible upgrade prices within the UK right here on this page.
Upgrading your existing phone with O2 is the best way to keep your number and your existing pay monthly package. Everything stays exactly the same whether you're billed online or via a paper bill each month. O2 customers can take advantage of an upgrade every 11 months i.e you no longer have to fulfill 12 months before you can upgrade your O2 phone.
Offers are only applicable to pay monthly O2 direct customers and O2 Online customers & excludes O2 Pay as you Go customers & customers who are billed by other O2 service providers such as The Carphone Warehouse & Singlepoint etc..
Check your upgrade eligibility here