I read from Need fast mobile internet while in Finland for 1 month that there are prepaid Finnish SIMs with data. I'm planning to go to Finland, Estonia, Sweden, Denmark and Norway.
Could someone confirm whether those SIMs would roam to other countries in Scandinavia?
From what I gathered, EU changed the roaming rules so that within it, there aren't really gigantic roaming costs anymore.
Is that the case?
It depends on the exact plan you get, but in general the most you should pay is about 6 cents per MB for roaming when inside the EU. Some providers may not let you roam on a prepaid plan so it's best to ask when you buy the SIM card.
Some providers may provide free roaming within the EU or the Nordics/Baltics. For example Sonera have a data plan for €24.90 for a month which lets you use the data in the Nordics and Baltics. You might be able to find a similar option for prepaid plans.
https://www.sonera.fi/kauppa/liittymat/nettiliittymat/prepaid-netti https://www.sonera.fi/dam/jcr:15386e12-dad3-4397-836c-44c919d73860/Sonera%20Wireless%20Surf%20Service%20Description.pdf
