Those vertical streaks are lens flare. They happen when strong light from the sun or another bright source hits the lens and reflects internally, creating bright artifacts in the image. On phones, this can show up as streaks because of the small lens design.

To reduce it:

• Avoid aiming the camera directly toward the sun or other bright light sources.
• Slightly change your angle or recompose the shot.
• Shade the lens with your hand or another object, being careful not to block the frame.
• Keep the lens clean, since smudges can make flare worse.

Sometimes flare is unavoidable, but changing position or shielding the lens usually helps.