Recently, my mind always wanders a melody: you know that you know that my cell phone was castrated do you know do you know my phone be castrated! Maybe remind me, write the phone to castrate this thing, right?
“Castrated” phone first began in Wapi times, early “Wifi castration”, caused a small stir. Year for consideration of national communications security support independently developed the Wapi in China (the Chinese version of Wifi), foreign mobile phones in China must be removed Wifi module, resulting in a certain degree of functional defects, netizens have an effect called “castration”.
With the popularity of Wifi, “castrated” seems to have become a historical concept, is mentioned again in 2014, my Apple 5S into China for the first time using the standard castration in customized handset market described mobile phone format compatibility is considered surgically removed, has caused another round of controversy! In fact, from the early years of “Wifi castration” different formats after castration phone isn’t easy to detect in daily use, but this led to the user being “castrated” will not be able to use other operator’s SIM card on the phone, get number for mobile phones, consumer choice by the constraint.
What is castration? What do you mean if I ask really castrate, Baidu search out of the frightening. Especially for small dogs, cats, and even a history of eunuchs, or what, so ask friends what do you mean not really castrate you must understand. Castration is a metaphor, not seriously.
Recently, the domestic mobile phone crazy, have made 5 die 10-channel, 7 die 18 frequency, or 7 modulo 20 concepts, behind the goal was simply trying to explain their functions support three carriers of various types of 2G/3G/4G network, in other words, description: my cell phone has not been castrated!
If say castration is going on the phone it is necessary to understand what is mold? What is the frequency?
Phone meaning model of castration is not complete or incomplete.
It is easy to understand! To understand the definitions.
First, what is the mode?
“Die” is phone of network standard, like a paragraph support 7 species network mode of Unicom contracts machine on including has GSM/EDGE (China Unicom and mobile of 2G network), and CDMA1x (China Telecom of 2G network), and EV-DO (China Telecom of 3G network), and WCDMA (China Unicom of 3G network), and TD-SCDMA (China Mobile of 3G network), and TD-LTE (mobile 4G network) and FDD-LTE (Unicom telecommunications 4G network).
It is important to note, the three operators of the current model status:
China Mobile is the largest user base of telecommunications operators, in the 2G era has huge advantage. But 3G times by failing to use international WCDMA suffer total defeat. TD-SCDMA backwardness, China Mobile is directly from the 2G to the 4G age. 4G moves is relying on its strong user base of sting. Now move 2G in GSM,3G TD-SCDMA,4G in a TD-LTE format.
China Unicom Incipio iPhone 6 Plus
In the 3G era, China Unicom was the most rapid development, success in competing for customers. FDD official granting of the licence let Unicom also stepped up again. In terms of network, 2G network of China Unicom and China Mobile are the same with GPRS and EDGE network, 3G network standard for WCDMA, and adopted in the 4G TD-LTE/FDD-LTE double 4G combination of hybrid networking.
Three operators of China Telecom has been slightly awkward, neither does not fire, but in the absolute number of users is still to be reckoned with, FDD obtained licence together with Unicom Telecom to occupy a certain advantage. In terms of network, China Telecom 2G network using CDMA1X network and 3G network using the CDMA2000,4G network with Unicom, are TD-LTE, FDD-LTE mixed network, dominated by FDD-LTE.
Simply put, it is because operators of the “model” is different, was responsible for the status of castration!
Why did in the 2G era, cell phones are not neutered?
Because the 2G age differences is not clear, GSM mobile and China Unicom are in development, China Telecom does not move at all, beginning of period net so 2G network standard almost never require users to worry about. 3G times, the diversity of standards caused big trouble for users and operators, when three carriers with standard, warlords divided China Mobile is operated by China’s self-developed TD-SCDMA, WCDMA Unicom international passage, China Telecom CDMA2000.
Varies greatly between the different, incompatible and castration. Results of castration is the basic means for operators to change the handset, users select your carrier and future network takes a greater cost.
Second, what is the frequency?
Network mode frequency, refer to each network band to a different, countries are divided into several different frequencies, so that they run on different frequencies, without interfering with each other. Generally speaking, like radios, tuned to different frequency is different.
Mobile phone networks as well as different bands of the radio, operating on different frequencies. Here are 2G, 3G, 4G, supported by different frequency bands. In particular:
1, 2G network
2, 3G network (WCDMA/TD)
WCDMA2100MHz/1900MHz/850MHz (China Unicom, 3G); Incipio iPhone 6 Case
TD-SCDMA1880-1920MHz/2010-2025MHz (mobile 3G);
CDMA20001920-1935MHz/2110-2125MHz (China Telecom 3G).
3, 4G network
TDD-LTE:1900MHz/2300MHz/2600MHz (mobile 4G);
LTEFDD:1800MHz/2600MHz (China Unicom and China Telecom, 4G).
Phone supports the frequencies, the more and more supported network, mobile phone roaming, the better.
As a simple example, such as 4G, run 1900MHz on this frequency in China, when the phone is roaming to the United States when, you may need to run on 2200MHz, to France and you may need to run 1800MHz on this frequency. Phone support for multiple frequency is very important. Otherwise, if China Mobile phone export to foreign countries if local network systems is not supported and that is a big problem. Simply put:
Band castration and castration.
4G era will also be neutered?
Answer is theoretically not castrated, but inertia will cut a knife. Know it used to be die-cut on two knives, cutting on the band twice! Progress, get less at least three knives! Because the 4G system there is no longer a great divide between, though still the difference of LTE-TDD and LTE-FDD duplex, compared the difference of 3G has been a lot of small, hardly constitute a selection doubt for users or net cost increase.
Thus, using a multiple model 4G can sweep the three operators ‘ networks.
So here’s the thing, castration technique which home?
Moved due to FDD has yet to license, has not provided a full CNC cell phone, so the current implementation is a custom scale, launch 5 die ten, terminology is complex, again again do not understand the explanation.
Custom simply means that he can only use mobile 4G, 3G networks, can only support the mobile band, then simply can only moved the number, need special cards. Therefore, the contract for China Mobile currently supports only GSM, TD-SCDMA, and TD-LTE of the three formats, has castrated three knives.
Unicom contract are double 4G Netcom, not castrated one knife. Due to hardware differences between China Telecom and China Unicom version not in practical use still has a slightly different, might only castrated up one size.
See here, there must be someone out: your kid moving black! I did not say that castration is not good, going to Thailand, saw several beauty in the convenience store, very nice! People are also good, good live!
To write so much, in fact, would like to ask you a question: do you want to buy an emasculated phone?
“The author” 4G of China, telecommunications industry analyst, Erik core experts, app: 3G (china_3g) micro blog: China 4G
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