Beste antwoord door David
I immediately checked your account and saw that you have a new contract, transferred from a PrePaid account. Therefore there was still a barring active, which is standard practice for all of these transfers. Normally this barring will be active for the term before paying two invoices, but I just lifted the barring of your subscription. If you restart your device everything should work!
You have a Go Unlimited rateplan, so you can use your data abroad, but you're not paying extra for this. You're paying the same amount abroad as you are in the Netherlands.
If you have any further questions, feel free to ask!
PS: I changed your username, as this was your phone number. Bear in mind that this is a public community, so everyone can read along and (ab)use your personal data if you place it in public messages.