"Spanish Android lock screen with green chalkboard math wallpaper

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This Spanish-language Android smartphone lock screen features a study-focused green chalkboard wallpaper covered in hand-drawn white chalk physics and math formulas, diagram sketches, and academic scribbles. The screen displays Yoigo carrier branding, the time 23:31, a Tiempo (weather) widget, an Einstein education quote notification from Telva, and the standard "Desliza hacia arriba para desbloquear" (swipe up to unlock) prompt. This nostalgic academic aesthetic is popular among STEM students and learners looking for educational phone background inspiration.