Zable memberships give you extra benefits.
There are two tiers:
Essentials (£3 a month) - daily credit alerts and 20% off Zable Mobile plans
Premium (£10 a month) - everything in Essentials, plus device insurance covering your mobile phone and up to 3 devices (such as a smartwatch, tablet, or wireless earphones), and a custom-designed physical card. Premium is only available to Zable credit card holders.