[peterdoo]

Yes, promos and specials count for EU roaming. What you would pay for a call/text from your home network to another network in the same country (the actual price, does not matter whether discounted or not) is what has to be charged in the EU for calls/texts (a surcharge is allowed until mid of this year).

On-net prices (from home network to home network) do not have any influence on roaming prices so those can be lower or with higher minutes limits.

For data the operators anyhow got many possibilities to limit the amount that can be used in EU roaming without surcharge. What they still can do, is to separate packages to a call/text part and a data part. As the price for the data package would be lower in this case than for the complete package, one would get less data without surcharge in roaming.