How cellphones can get you killed on the modern battlefield, according to a US Army officer

• A US Army officer said military trainers had warned soldiers of the dangers of cellphone use.
• "The cellphone is the new cigarette in the foxhole," he told Foreign Policy.
• Ukraine has used Russian soldiers' cellular data to locate and target their positions.

Cellphones have revolutionized the ways war is documented, providing snapshots of life on the front lines, glimpses of the latest military equipment, and harrowing images of death and destruction.

But they are also potentially lethal for the soldiers carrying them, a US Army officer has said.