Hello @EveSil ,
Welcome to the community,
It is not the SIM card that is dual sim but the phone. You would need a phone that enables dual sim. Which phone do you have?
In order to have dual sim, you would need to different numbers, which can either be the same network, or if the phone is unlocked, from two different networks. You may want to take a look here:
https://ee.co.uk/help/help-new/getting-started-and-upgrading/setting-up-an-esim/how-do-i-use-dual-si...
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using web based app or another phone: +44 800 079 8586 or +44 800 956 6000.
