Hi Hopelin,
Welcome and thank you for posting 🙂
You will be able to use your SIM whilst you are travelling but you will need to ensure roaming is activated at least 24 hours prior to leaving the UK. You can do this by speaking to our team on 789 or via your online account here
For all information regarding roaming whilst in The Netherland, please click here.
If you have any further questions, please do not hesitate to get back in touch but if not, have a lovely time.
Thanks
Nat