Mobile plan in Europe - Lemmy.World

In every country there are several mobile service providers. And with current EU regulations no mobile provider can charge extra for traveling within EU. Mobile providers in my country are definitely more expensive that average European mobile plan. I was wondering, can I downgrade my current plan to only keep my current phone number and purchase a plan from a cheaper mobile provider in another EU country with unlimited data and just use roaming all the time since I’m in EU? What are your thoughts? Do you know about a cheap mobile data plan?