An eSIM makes it much easier to switch mobile networks. ... In the UK, EE, O2 and Vodafone all currently support eSIMs in some capacity. Compare Mobile Phone Contracts & SIM-Only Deals.

In the US, all major carriers support eSIMs, while in the UK, EE, Lycamobile, O2, Three, and Vodafone all support virtual SIM cards. Plus, you’ll find support around the world with all manner of ...

O2 SIM cards How you activate your O2 SIM will depend whether you are on a pay-monthly or pay-as-you-go deal. It will also depend on whether you’re already an O2 customer or are new to O2.