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The new price regulations will take effect on May 15th, 2019.
For completeness of the answer, the legal basis is Regulation (EU) 2018/1971, which added a new article 5a to Regulation (EU) 2015/2120:
Article 5a
Retail charges for regulated intra-EU communications
- From 15 May 2019, any retail price (excluding VAT) charged to consumers for regulated intra-EU communications shall not exceed EUR 0,19 per minute for calls and EUR 0,06 per SMS message.