At present, which 3G mobile phone card of Nanyue, Shenzhen Unicom and Telecom works well? thank you

At present, the signal speed of China Unicom is relatively stable. After all, China Unicom uses foreign mature technology, while China Unicom uses WCDMA technology, which is the fusion of several technologies in Europe and Japan. Ericsson, Nokia, Siemens, Fujitsu and Aka are all major research and development companies of WCDMA technology.

Mobile individuals feel bad, using the 3G network standard TD-SCDMA technology, which is mainly developed by Chinese and foreign companies such as China Datang and German Siemens, and is considered as the 3G technology dominated by China. But basically failed. After all, the domestic R&D technology is not very good, and now it has directly transitioned to research and development of 4G, so 3G R&D is basically a failure.

China Telecom's 3G network is CDMA2000. This is led by Qualcomm, and Ericsson, Nokia and Siemens are also involved. If it is a laptop network card, choose telecommunications, the signal is the best, the network speed is not as stable as Unicom, and the tariff is cheap.