He faces up to 20 years in jail if convicted.
Krebs on Securityrevealedmore information about Wagenius, including his status as a US soldier.
To show he was serious, he released a sample of the stolen data.
The two are alleged to have netted around $2 million from the heist.
Customers of Indian state-owned telecom firm BSNL are believed to have also been affected.
