Tinfoil is not sufficent any more due to increased sensitivy of interceptors. False protection left in place as ploy. False TEMPEST protection is especially effective, the best remains classified in a rolling fashion: more leaked to delude the more unleaked of what works. Inadvertent emanations are increasingly inadvertent as research in those waves leaps by giant bounds. Not news to this crafty gaggle of uncontrollably paranoidic deceptors braying about faults, patches, new faults, new paths, rolling thunder to panic herds of panic-herders, pardon, infiltrated standards setters. Jim, you may be the only experienced expert here in betrayal by trustees inside and outside the penal colony, pardon, West of the Pecos justice rigged-comsec industry. All hail MIT, industry leader of techno-rigging. BTW, are you at liberty to reveal the secrets of bio-chemical TEMPEST? The inadvertent body odor is somewhat more reliable than facial and corporeal. Rumor of testing on the bio-chem harvesting in prisons, separation of sexes into their many varieties of posturing, impostering, hybridity and crossings. After 9/11 batteries of full sprectrum bio-chem sensors were set up in NYC transporation nodes, pretending to be about snffing for bombs but actually about varieties of human emanations. Later transformed and cloaked into the Microsoft-NYPD Domain Awareness program which pretended to be about data-gathering and infiltrating suspected terrorist conclaves, vaunted by resucitated HUMINT, but about, well, that's not for the inexperienced emanator to know.
Why not wrap the phone in a couple of layers of aluminum foil? (Although, it won't shield against audio if that's being recorded even while an RF contact does not exist...) Jim Bell