You can ask in this small series have hope right straightaway, dare not be too professional? Also, I do not know you Ah Xiao Bian is still my question comply? Why most phones do not support the entire network?
Well, small as fully as possible that some of my friends also want a better understanding of the problem, Xiao Bian will try to say after simple. Into the problem, the shortage of the entire network models also regarded as a commonplace problem, in fact, talking about this issue but also with the times to distinguish, in the 3G era, to achieve full Netcom phone indeed very few, and into the 4G era we can clearly feel the entire network of mobile phone has increased, but the reason is there such a problem simply because a few points.
First, the camp:
In 3G era, mobile phone network is essentially divided Link WCDMA and TelecommunicationsThe CDMA2000 two camps,Move Pseudo 3G network TD-SC Why not go DMA count, Xiao Bian do not say we understand. Unicom's WCDMA is the original GSM supporters, Telecom CDMA2000 is the original supporters of Qualcomm CDMA system. Both baseband, RF are not the same, so the phone manufacturers tend to pre-selected carriers do baseband, RF development, in general, taking into account the compatibility between their camp, handset manufacturers will do the WCDMA and GSM Together, The CDMA2000 1x / EVDO do together.
Second, the cost:
And from a cost point of view, in the 3G era, the entire network can be said that the phone is a very extravagant waste of resources. Many people may not know, all mobile phone network and you want to support the corresponding network standard are required to pay a fee, and this fee is not cheap. The phone supports WCDMA want to support CDMA2000? No problem, the money in place on OK, anyway, we all know that CDMA standard network license fee has always been led by a high-pass money, which can be seen from the general to another job telecom version of the phone price, so if you want to support the entire network, the phone manufacturers would pay twice as much or even more additional costs. While eliminating licensing costs aside, the phone to receive different networks require different standard modem, which for handset manufacturers, and is not a small overhead. Increased costs, profit margins declined naturally, for you are the mobile phone manufacturers, you will think of the introduction of the entire network phone? A lot of problems, empathy next obvious.
Third, the technology:
Apart interests considerations, 3G mobile phone era is so rare entire network, hardware and software limitations with the level of production also have a certain relationship, in the 3G era, a variety of different formats on a single chip integration may be more difficult, so we look The entire network to 3G mobile phone era are in the late basically only gradually appear in our field of vision.
Then to the 4G era, why the entire network of mobile phones have become more of a trend, because the 4G LTE itself is a grand unified era, so the order led by chip maker Qualcomm, the development of the entire network chip to help meet customers' We need, and get the support of chip manufacturers, mobile phone manufacturers are happy to enjoy it as natural. But although most of the phone's hardware supports the entire network, but is still limited by the contention between operators, many mobile phones are often not really realize the entire network, the majority of standard mobile phone will be locked, and sometimes even the same standard cell phone operators will be by way of limitation band phone lock join rival network, users want real use, only unlocked manually by brush, although reluctantly, but also at least the hope of the entire network.
