How does the free incoming calls feature work, and what is the UK phone number?

The ETravelSim Romania eSIM includes a UK-based mobile number (+44) with free incoming calls — anyone in the world can call your assigned UK number and reach you in Romania at no cost to you. Outgoing calls aren't included, so use WhatsApp, FaceTime, or Skype for outbound voice. The UK number is useful for receiving callbacks from hotels, tour operators, or family who would otherwise pay international rates to reach you. This feature is unusual for travel eSIMs and a genuine differentiator on Romania plans.