The investigation comes as Facebook is trying to settle a case accusing the social network of illegally capturing users' facial data.
Detectives needed access to data stored on the handset potentially linked to a drug investigation, an official said.
Millions can open bank accounts and make cashless transactions and financial access for marginalized groups has improved. But concerns over surveillance and the security of people's information remain.
In preparation for the next generation of social payments, Visa is testing and refining all sorts of behavioral biometrics.
The new software makes it possible for people to scan faces on their phones.
The interior minister suggested introducing facial recognition software at transport hubs.
Researchers discover way to defeat facial recognition systems using publicly available photos.
Researchers were able to identify individuals from their brain patterns with 100 percent accuracy.
"Starbug" was able to re-create the thumbprint of German Defense Minister Ursula von der Leyen using public photographs.