[seabass-labrax]

> ...that is what police and other government agencies interested in operating IMSI catchers exploit.

Is encryption really significant to whether or not the police are able to monitor cellular phones? As bandwidth is already centrally allocated, there is a limited number of legal cellular network operators, and a competent authority could already compel (indeed, could have already compelled) mobile operators to provide master keys and diversification information under the Snooper Charter 2016[1].

https://www.legislation.gov.uk/ukpga/2016/25/

[LZ2DMV]

This implies compliance with the law and a formal procedure, and an authority might not always follow the law for various reasons. At least the use of encryption means one is less likely to be a subject of surveillance in an unlawful manner.

Consider intelligence operation abroad, for example.