Hello @Amy9928 ,
Welcome to the community,
I take it you are on pay as you go.
When did you last use your mobile to make a chargeable call or text as it looks like it may have gone into hibernation, that is your SIM card?
You may want to take a look here:
https://community.ee.co.uk/t5/Pay-as-you-go/What-is-pay-as-you-go-and-flex-hibernation-and-how-do-I-...
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.
