This has a closed source baseband that was also not designed by the company producing the phone. The baseband is pretty much guaranteed to be backdoored by your favorite state security agency, so why get this over any other Android phone?
Being very clear about what they can do, as well as what they can't do, would be a very good thing.
Mobile telephones are a difficult item to make secure. Getting telcos to cooperate with law enforcement doesn't seem to have posed many problems so far.