British soldier jailed for keeping SIM card in phone during Estonia deployment

A British corporal has been sentenced to 10 months in detention after a court found he disobeyed a direct order to remove the SIM card from his mobile phone before deploying to Estonia. The case, detailed in a 21-page appeals court document, resulted in a guilty plea for disobeying a lawful command and a reduction in rank for Daniel Barton-Kennedy.

The incident traces back to January 2026, when Barton-Kennedy, a corporal with over seven years of service in the 1st Battalion of the Duke of Lancaster Regiment, was assigned to Exercise Eastern Warrior. The unit was stationed in Tapa, a town in Estonia located roughly 90 miles west of the Russian border. The deployment site is situated approximately halfway between the capital, Tallinn, and the international frontier.

Operational security requirements were communicated to the soldiers on January 7, 2026. The briefing explicitly instructed personnel to remove SIM cards from personal electronic devices, switch off location settings, and utilize a trusted virtual private network. These instructions were reinforced with additional briefings after the unit arrived in Estonia several days later. Despite the repeated directives, Barton-Kennedy kept the SIM card in his phone.

The failure to follow protocol left the device vulnerable. Court records indicate that the phone was subsequently hacked. Intimate photos stored on the device were stolen and used to blackmail the soldier. The breach of security led to the military disciplinary proceedings that resulted in his conviction.

The case was initially reported by the Estonian newspaper Eesti Ekspress, which obtained the appeals court documentation. The soldier’s defense and sentencing have concluded, with the 10-month detention order now in effect. The incident underscores the strict adherence to digital hygiene protocols required for troops operating near adversarial territories.

Barton-Kennedy’s rank has been reduced as part of his punishment. The 10-month detention sentence is to be served following his guilty plea. The case serves as a documented instance of operational security lapse leading to tangible disciplinary action within the British Army.