Talk:United Kingdom/@comment-91.158.123.202-20180304155208/@comment-24682153-20180305055126

The max. data of all packages you can buy that is given out in roaming (according to Feel like home) is still capped at 9 GB per month. You can add as many data packages as you like to your plan, it will stay at 9 GB in total for roaming. Any other add-ons beyond only give you UK data. So with Three it's generally not a good idea to get at plan >10 GB to be used in roaming exclusively.

The pay as you go rate of Three is 1 penny (sing. of pence) per MB. The same PAYG rate is charged in the EU/EEA countries. Three has introduced some measures against bill shock some years ago. They effectively mean that roaming is shut off, when your roaming bill exceeds £42 per month. This will happen when you use the PAYG rate (of one penny per MB) for more than 4200 MB (that's a little less than 4.2 GB).

You see, that these are two different caps concerning two different rates.