> It works with simple feature phones that often are allowed into sensitive environments where smartphone are not, because they have only voice and text-messagi

> It works with simple feature phones that often are allowed into sensitive environments where smartphone are not, because they have only voice and text-messaging capabilities and presumably can’t be turned into listening devices by spies. I have no idea where they got this information from, because it is absolutely false in DOD classified environments. Anything that can be used as a recording device or that can transmit information wirelessly is restricted or prohibited, and personally-owned examples are strictly prohibited. In very strict environments, even receive-only electronics may be restricted. I am not personally aware of any policy that makes a distinction between "smartphones" and "feature phones". The only thing I have ever seen referenced is phones with cameras, and even that was only for visitors in the unclassified areas.