Certain materials used in current phone cases can block the mmWave frequencies used in some 5G networks. D3O has developed a new, less-dense version of its D3O shock-absorbing material that lets mmWave 5G signals pass through unimpeded. D3O calls it D3O with 5G Signal Plus Technology
. The material is impregnated with "micro-voids" to make it less dense. D3O says it can provide the same degree of shock absorption as its standard material. Gear4 (a Zagg brand) is the exclusive licensee and user of D3O material for phone cases, and will use D3O with 5G Signal Plus Technology in its 2020 cases for 5G phones.