Network Access Mode and access speed

3G: when the Internet access is displayed as "3G", it proves that you can use the carrier's 3G network.

Because the 3G network of the iPhone 4 only supports WCDMA users, the 3G network of the iPhone 4 cannot be used even if the SIM card of your mobile phone supports 3G network but is not in Wcmd A mode.

3G networks are fast and commonly used.

The SIM card is different. The author can only access the network through the EDGE network.

EDGE: When Internet access is displayed as "E", it indicates that you can use the EDGE network of the carrier currently. However, EDGE networks are much slower than 3G networks.

GPRS: when the Internet access is displayed as "G", it proves that you can currently use the carrier's GPRS network. However, the GPRS network is one of the three most slow access modes. This may occur in areas with insufficient network coverage around the city.

V. P. N: encrypted security network. Currently, it is generally used for foreign networks. Set www. fan8.us/misc/help.

WIFI: because China's Mobile Wi-Fi network is very backward, most of the Wi-Fi networks we visit are wireless routes at home or in public places.

When you enable the Wi-Fi mode in the background and successfully access the network, the Internet access column displays a flag similar to a wireless route transmitter.

The more WIFI signal formats, the stronger the signal. WIFI is also the fastest. The speed depends on the speed of the network you are connected.