Not necessarily, but as long as it is a GPRS network, the speed is the same. The EDGE directly connected by Unicom Shanghai Branch is the real EDGE, while the EDGE of China Mobile loads the module on GPRS, which is slow.

If you want to surf the internet, I suggest CDMA card, which is faster than mobile and has good signal. If it's cheaper, it's GPRS, the network speed is the same, GPRS makes no difference, except QQ (mobile version), some provinces, some provinces, but if you use a wireless network card, it makes no difference.