Will my CheapESIM provide a reliable signal on Spain's high-speed trains (Renfe/Iryo)?

Yes, your CheapESIM will generally provide a strong and stable 4G/5G signal for the majority of your journey on Spain's high-speed trains like Renfe or Iryo. The country boasts an excellent mobile network infrastructure that extends along most major rail routes, such as Madrid to Seville. However, it's realistic to expect brief signal interruptions when trains pass through long tunnels or very remote, mountainous regions. For the vast majority of your trip, you can confidently use your data for streaming, working, or staying connected, ensuring good value for your travel experience.