It is likely that you've ran out of Data in that case. The My3 page can sometimes be behind when it comes to working out roaming usage, although I've never seen it be behind for more than a few hours.
The Three.co.uk is a zero rated page and that means that it can be accessed when there is no free allowance left. Since you can access it, it means your data connection is working OK. If you're on a contract, you can continue using Data, but you'll need to raise your spend cap and credit allowance in order to allow the system to charge you for what you use, alternatively, you can buy the Data Passport for £5 per day to give you access to Unlimited Data for 24 hours.
Pete.
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