Hello @Rachy4 ,
Welcome to the community,
Do you still have the phone? If you do, are you able to charge it up? You should then be able to see the make and model. How old is it, do you have any idea?
Click on this link and you will see on the right side a list of phones you could click on and it should show you and you may find it that way;
https://en.wikipedia.org/wiki/IPhone
To contact EE customer service dial 150 from your mobile phone or ring customer service for free using Skype or another phone: +44 800 079 8586 or +44 800 956 6000.
