China Mobile has four types of mobile network icons: "g, E, T, H ".
G: GPRS, commonly known as 2.5g, is a 2G network. It is a data transmission mode based on the GSM standard. This is an early wireless network transmission mode, the theoretical peak transmission rate can reach 114 kbps (14.25 K/s ).
E: edge, commonly known as 2.75 GB, still belongs to 2 GB network and is also a data transmission mode based on GSM. This is a mainstream wireless network transmission mode, the theoretical peak transmission rate can reach 384 kbps (48 kb/s ).
T: Full name: TD-SCDMA, commonly known as 3G, belongs to 3G network, this is the technology with the National proprietary intellectual property rights, but this technology is still in the initial stage, the theoretical peak transmission rate can reach 3025.6 kbps (378.2kb/s ).
H: Full name: HSPA, divided into HSDPA and hsupa, commonly known as 3.5g, still belongs to the 3G network, based on TD-SCDMA technology, the theoretical peak transmission rate can reach 96000 kbps (12 m/s ).
The mobile phone automatically switches between the "G, E, T, H" frequencies based on the signal strength.
China Telecom has two types of mobile phone network icons: "1x, 3G ".
1x: it is called CDMA 1X and belongs to a 2G network. This is an early CDMA wireless network transmission mode. The theoretical peak transmission rate can reach 153.6 kbps (19.2 K/s ).
3G: All called CDMA
2000 is a 3G network and is a data transmission mode based on the evdo standard. This is a mainstream wireless network transmission mode. The theoretical peak transmission rate can reach 3.1 Mbps (387.5 K/s ).
The mobile phone will automatically switch between the "1x, 3g" frequencies based on the signal strength.
China Unicom has three types of mobile network icons: G, E, and H ".
G: GPRS, commonly known as 2.5g, is a 2G network. It is a data transmission mode based on the GSM standard. This is an early wireless network transmission mode, the theoretical peak transmission rate is 114 kbps (14.25 K/s ).
E: edge, commonly known as 2.75 GB, still belongs to 2 GB network and is also a data transmission mode based on GSM. This is a mainstream wireless network transmission mode, the theoretical peak transmission rate can reach 384 kbps (48 kb/s ).
H: HSPA, which is divided into two types: HSDPA and hsupa. It is commonly known as 3G and belongs to 3G networks. Based on WCDMA technology, the theoretical peak transmission rate can reach 72000 kbps (9 m/s ).
The mobile phone automatically switches between the "G, E, H" frequencies based on the signal strength.
Comparison of mobile phone networks used by three mobile operators
1. CDMA is a 3G network standard. Currently, China Telecom uses this standard for 3G networks. WCDMA is the choice of China Unicom 3G standard, TD-SCDMA is mobile 3G standard.
Dual-card: dual-mode Dual-card and single-mode Dual-card. Most dual-mode Dual-card mobile phones support both GSM and CDMA, and can have a mobile/Unicom card and a telecom card. Most single-mode Dual-cards refer to GSM dual-card or CDMA Dual-card (CDMA Dual-card is relatively small). Two mobile/Unicom cards or two Telecom cards can be deployed at the same time.
Dual Mode means that mobile phones support two network systems. The current 3G mobile phone is mostly dual-mode mobile phone, WCDMA Mobile Phone compatible with GSM standard, TD-SCDMA mobile phone compatible with GSM standard, CDMA 2000 mobile phone compatible with CDMA standard. There are also cross-standard dual modes, such as GSM/CDMA Dual-mode.
2. if a mobile phone supports both the GSM and CDMA standard, it may not be able to use three cards. For example, although HTC s710d supports the GSM/CDMA standard, it can only use a telecom card, not only because the mobile phone is customized by China Telecom, this is also because the mobile phone is a dual-mode single-card.
Currently, in mainland China, if a mobile phone needs to be able to use the cards of three carriers at the same time, it must be dual-mode Dual-card dual-waiting and dual-mode GSM/CDMA Dual-mode.
3. Let's briefly talk about the network standards of the three carriers.
China Unicom's 2G network standard is a GSM standard, and the GSM standard is currently the most widely used 2G standard in the world. More than 80% of operators use the GSM standard for 2G networks. China Unicom's 3G network standard is WCDMA, and WCDMA m is currently the most widely used 3G network standard in the world. More than 80% of operators choose WCDMA for their 3G networks.
Mobile 2G network is also GSM, but mobile 3G network standard is TD-SCDMA, TD-SCDMA Standard 3G network is currently the world's mobile operators in use.
China Telecom's 2G standard is CDMA, which is popular in America and Japan and South Korea. China Telecom's 3G standard is CDMA, which is also popular in America.
Tri-Netcom eat, dual-card dual-waiting single-card multimode
When we purchase a mobile phone, we often hear the saying "Three Netcom eats", "dual-card dual-waiting", or "Single-card multimode" on a mobile phone. What do they mean?
Sannetcom
Three Netcom is a mobile phone that supports three network types: GSM, CDMA, and WCDMA. Users can select China Mobile or China Unicom's 2G network, or China Unicom or China Telecom's 3G network. For example, Xiaomi mobile phones of the Telecom version, although customized by China Telecom, support three types of networks at the same time, and users do not need to be limited by operators.
Dual-card dual-standby
"Dual-card dual-waiting" means a mobile phone can be inserted with two mobile phone cards of two carriers at the same time, and can be used for standby at the same time (when a card is in use, B card can be normally called, the pop-up prompt allows the user to choose to keep the answer or switch to the B card is called "dual-pass". If the call fails, it is called "single-pass "). In fact, the identification method is very simple. When we purchase dual-card dual-Wait mobile phones, it is best to use the card to call the B card. What can be dialed is "dual-Connect ", the general rule cannot be "single pass ".
Single-card single-mode, single-Card Multi-Mode
Single-card multimode means that a mobile phone has only one SIM card slot, but it can support multiple mobile phones of different network operators. For example, if the iPhone 4S of the Telecom version only supports the CDMA 2000 network, the iPhone 4S of the Telecom version is a single-card single-mode model, china Unicom Xiaomi mobile phones support two types of networks: GSM and WCDMA, namely single-card dual-mode. While China Telecom Xiaomi mobile phones support three types of networks: CDMA 2000, WCDMA, and GSM, which are called Single-card multimode.
Mobile network standard knowledge
The mobile phone name is GSM: it indicates that only China Unicom or China Mobile 2G segments (130, 131, 132, 134, 135, 136, 137, 138, 139, 145, 147, 150, 151, 152, 155, 156, 157, 158, 159, 182, 185, 186, 187, 188)
The mobile phone name is CDMA, indicating that only China Telecom 2G segments (133, 153, 180, 181, 189) are supported)
The mobile phone name is WCDMA/GSM, indicating that China Unicom or China Mobile 2G segments are supported, and China Unicom 3G segment (130, 131, 132, 134, 135, 136, 137, 138, 139, 145, 147, 150, 151, 152, 155, 156, 157, 158, 159, 182, 185, 186, 187, 188 ), mobile 3G services are not supported, and telecom cards are not supported.
Mobile phone name has TD-SCDMA/GSM: to support China Unicom or China Mobile 2G segment, china Mobile 3G segment (130, 131, 132, 134, 135, 136, 137, 138, 139, 145, 147, 150, 151, 152, 155, 156, 157, 158 ,), 159, 182, 185, 186, 187, 188 ), china Unicom 3G business is not supported, and telecom card is not supported.
The mobile phone names include CDMA 133 and CDMA, indicating that China Telecom 2G segments are supported and China Telecom 3G segments (153, 180, 181, 189, and) are not supported.
The mobile phone name is "CDMA 2000"/"GSM" (dual-mode Dual-Wait "): indicating that one card supports China Telecom's 2G segment and China Telecom's 3G segment (133, 153, 180, 181, 189 ), the other card supports the speech and text message functions of China Mobile or China Unicom 2G segments.
