Hertz successfully verified that electromagnetic waves and light have the same speed. This important experimental conclusion made electromagnetism and optics unified, and became the experimental basis of electrodynamics, which now is also one of the most important experiments in university physics. In this paper, a splitring resonator circuit under cellular wireless network is successfully designed and prepared. An accurate value of the speed of light as (3.007±0.018)×108 m/s is obtained by standing wave method, which is in good agreement with its actual value 2.998×108 m/s. In this experiment, only cellular phones and a splitring resonator circuit board (with circuit board design provided) are required, thus it can be carried out anywhere, where an identical observation method as Hertz's original experiment can be done. It may pave new road for relevant demonstrations for university and high school students.