I inserted a SIM for au MVNO
Speaking of cheap SIMs, it was only a few years ago that there was only a docomo network.In 2014, "MINEO" and "UQ Mobile" entered, and cheap SIMs on au networks started, and increased thereafter.It is now possible to select a network at the same price, such as IIJmio in 2016, BIGLOBE in 2017, and Aeon Mobile in 2018.
If you feel late with a docomo network, try using an au network
The difference between docomo and au network is the cover area.In fact, it covers various places in Japan, and there is almost no change in urban areas, and there is no change in places where people are in the suburbs.However, the more you go to the mountains, the more the area will come out.
At present, both areas are enriched so that they are not particularly better, but there are places that have a weak radio wave.
Unfortunately, your home may be a hole in the area, and in a house you will not be able to use a network of a specific mobile phone company in order to use it stably every corner of the house.
The difference outside of the area is that the cheap SIM of the au network is currently limited to LTE communication.
Calls are limited to VoLTE except for some, so it cannot be used unless it is an LTE area.
However, in DoCoMo, it may be 3G in places with weak rural areas and radio waves, but au does not have a difference in the area in 3G and LTE.That point is hardly disadvantageous.
All calls are limited to LTEs, which is disadvantageous when two cheap SIMs are prepared and DSDS machines are stuck at the same time.In particular, a "DSDV" machine that can do two LTE communication at the same time is required to stand up with two au systems.
And, although it is an important communication stability, if there is a docomo and au plan in a cheap SIM, the congestion of the network may be different.If you are in trouble with DOCOMO, switching to au may eliminate congestion.
Watch out for how to select a smartphone AU brand smartphone cannot be used as it is
Subsequently, compatible models may be a problem.The main points are SIM locks, au voltes, and frequency bands.
In the case of au -based networks, it seems that au brand terminals as well as SIM -free machines can be used, but the problem is SIM lock.DOCOMO's terminals could be used as they were, but not the au system.Except for VoLTE and very recent devices, even if it is an au brand, it is necessary to unlock SIM.
Specifically, I would like you to refer to the compatible model information such as mineo, but even if there is au's "Galaxy S8" (SCV36) at hand, the cheap SIM of the au system cannot be used unless you unlock the SIM.
However, the restrictions are also released by the Ministry of Internal Affairs and Communications guidelines, and the latest models such as the "iPhone 8", "iPhone X" and "Xperia XZ1" (SOV36) released after the fall of 2017 are used without SIM unlocking.can.
The next problem is that when making voice calls, it is essential to support au Volte.For models before VoLTE, you can use non -VOLTE audio call SIMs in mineo or UQ mobile, but you can only select a model that supports au Volte because you can only make Volte contracts with other cheap SIMs of other businesses.
The availability of au VoLTE is that in the case of famous SIM -free machines and au brand models, the cheap SIM operator may verify and list in the correspondence table.
The last problem is the corresponding frequency band.It is unlikely that any model can be used at all because it corresponds to band 1.However, the 800 or 900MHz band, which is called a platinum band, has different bands from docomo (band 19), au (band 18 or 26), and Softbank (band 8).
Therefore, in the case of a SIM -free machine assuming a model that unlocked the SIM unlocked for other businesses, it is disadvantageous in the area that can be used.
In fact, if a model that does not support the 800MHz band is not available on the au network, it is common to have outside the area (or the antenna mark transparent), or that the antenna mark is standing but the communication is not stable.
In addition, each company (docomo, au, Softbank) has been published on the web for career model support bands.
