MTS-owned 5G base station developer Irtea is in talks with a number of Chinese smartphone manufacturers to test devices in the 4.4-4.9 GHz band. Company is betting on Chinese devices, as Western vendors have already limited cooperation with Russian telecom operators to customize the operation of their equipment. But even if Asian gadgets are upgraded to 4.8-5.0 GHz frequencies, their operation may be unstable, as the range has a number of limitations.