Talk:European Union/@comment-33991484-20171217070858/@comment-24682153-20171221221700

Let me show you on your three examples what obstacles you have to overcome. Beyond doubt they are one of the best examples for big data in Europe now:

Vodafone UK Big Bundle 20 GB for £30 (€34). pro: extended roaming area, 4G roaming, no registration, online available, no FUP -  contra: you need an UK credit card to top up or pay surcharges, roaming on Vodafone networks only.

Orange Spain Go Fly: 10.5 GB for €20. pro: 4G roaming and a big selection of roaming networks; contra: registration in Spain required or for heavy surcharge online. Can't be topped up with a non-Spanish credit card, you need to use agencies with surcharge. Mentions FUP against permanent roaming, enforcement not clear.

Three UK PAYG: 9 GB for £20 (€23). pro: more than 60 countries, no registration - available online contra: no 4G roaming, no mobile hotspot use, strict 4 month's FUP, can't be topped up with a non-UK credit card - you need an agency with surcharges, not expandable.

You see all your cards have advantages and disadvantages. Some are minor, others are major - but this depends on the specifics of the user. And with none of the examples mentioned above you'll end up effectively at the rates the seller advertises.