check these

http://europa.eu/youreurope/citizens...s/index_en.htm

https://ec.europa.eu/digital-single-...licies/roaming

those articles also state example of users on Pay As You Go plan.

was supposed to go into effect on jun 15, but i was getting 'traditional' roaming rates on the 15th AND the 19th in FR and DE.

yesterday in HU I was notified of a new unified EU-rate...although the fair use surcharge is 9.24EUR/GB instead of the 7.70EUR stated in those articles.....so im still a bit skeptical of the implementation of these things.

as far as 4G speed if your phone has compatible bands you should get it. although if you have a US phone, some bands you dont receive. but unless youre trying to stream 1080p movies i dont think its such a big issue