Nnamdi Kanu, leader of the banned Indigenous People of Biafra (IPOB) on Wednesday pleaded not guilty to the 15-count charges anchoring on terrorism.
This was as the federal government brought documentary evidence to court.
The electronic devices were inspected by the lead counsel to the Federal Government of Nigeria, Shuaib Labaran.
Kanu was first arrested in 2015 but disappeared while on bail in April 2017.
His social media posts during his absence and his Radio Biafra broadcasts outraged the government, which said they encouraged attacks on security forces.
Security agents first produced him in court in Abuja on June 29, 2021 after detaining him in an undisclosed country.
His lawyer alleged he was detained and mistreated in Kenya, though Kenya has denied involvement. He has since that time appeared in court severally.
Kanu’s IPOB is agitating for the seccession and sovereignty of Eastern Nigeria. It accuses the federal government of marginalisation.