Yes, with your data limited to 15 GB / month if you have more. It's in the EU where you may use your normal allowances.
Make sure you text ROAMING to 150 before you leave to check you have roaming enabled on your a/c.
Welcome to the community. 🙂
I see @XRaySpeX has given you an answer to your question.
Find out more about roaming in the EU >
Have a brilliant time in Bulgaria. 🙂
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