Hello @laurabaird235 ,
Welcome to the community,
SIM cards are sent out via second class post, so with Christmas post etc.will depend how quickly it is delivered to you, we have no idea, but should take about four working days normally.
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.
