Can SIM be used as it is?What do you want to return to 4G?――I asked what you were interested in in the “5G” contract -itmedia Mobile

　NTT DOCOMO, au (KDDI and Okinawa Cellular Phone), and SoftBank have started commercial services for 5G (5th generation mobile communication system).

　For each carrier, the 5G communication service is "separate" from the 4G (LTE) communication service."How much does it take to change the contract?" "What happens to the SIM card you are using now?" "If you are dissatisfied with 5G services, can you return to 4G contract?"

　Therefore, we asked the spokeswoman of each carrier about the "worrisome thing" about the transition procedure to the 5G service.(All fees and fees in the article are excluded tax. The exchange is posted after partially prepared)

――What is the administrative fee related to new contracts, model changes and contract changes (changes from 3G / 4G services)?

New contracts and contract changes including docomo MNP (number portability) are 3000 yen, and model changes are 2000 yen.In addition, the fee is free when the procedure is performed at the docomo online shop at the same time as the terminal purchase, but depending on the contract status of the customer, it may not be possible to proceed in the online shop (reference link).

New contracts and contract changes including KDDI MNP are 3000 yen, and model changes are 2000 yen.

Softbank is 3000 yen for both.

――Is it possible to return the 5G contract to a 4G contract or 3G contract?Please let me know if there are any restrictions on returning.

It is possible to return the docomo 5G contract to the XI (LTE) contract.In that case, an administrative fee will be charged.However, it cannot be returned to the XI plan that has been discontinued.In addition, since the 5G terminal cannot use the Xi contract and the SIM card with a string, the terminal must be returned to Xi compatible.

You can return to the KDDI 4G LTE contract.In that case, an administrative fee will be charged.Since the new acceptance has been terminated, it cannot be returned to 3G.Please note that the 4G LTE contract SIM card cannot be used on the 5G terminal.

If you return to SoftBank 3G or 4G LTE contract, you need to change the model (contract change).In that case, an administrative fee will be charged.

――Is can I purchase 5G terminals without a contract (single item)?Where can I buy it if I can?

You can purchase it at DoCoMo DoCoMo Shop, mass retailer, and online shop.However, when purchasing at an online shop, we ask you to join the "Smartphone OK Program".

You can purchase at au dealers except KDDI online shops.

It can be purchased at SoftBank dealers excluding SoftBank Online Shop.If you use our 5G service, you need to join the "5G basic fee".

――In the case of a contract change, can you use your SIM (UIM / usim) card as it is?

If the SIM card used in the docomo is "DOCOMO NANOUIM Card" after version 4, it can be used as a 5G service SIM card without replacing it.(Author Note: Version 4 is "red", version 5 is "pink", the latest version 6 is "blue")

It is necessary to replace it with the change to the KDDI 5G contract.(The UIM card used is the same "au Nano IC CARD 04 LE" as the conventional 3G non -compatible 4G LTE contract).

In the event of a change from the SoftBank 3G contract, it is necessary to replace it.If you change from a 4G LTE contract, you can use your USIM card as it is.(At present, the USIM card used differs depending on the model, like the 4G LTE service, so it is assumed that the same USIM card is used) (Reference link 1 / Part 2)

――Is it possible to use a 5G contract SIM card on a 3G device or 4G device?

As a docomo rule, we do not confirm the operation, so we cannot guarantee any operation.Even if it is available, the communication speed may decrease, the call or communication may be unable to be able to call, and the behavior of the terminal may be strange.If used, please use it at your responsibility.(Author Note: DOCOMO's website contains information on the operation of Xi terminals in 5G contracts, but is not the purpose of guaranteeing the operation).

KDDI cannot be used.

Although it is not available on SoftBank 3G terminals, it can be used as it is on 4G LTE terminal.

―― Conversely, can I use a 3G / 4G contract SIM card on a 5G terminal?

As a docomo rule, we do not confirm the operation, so we cannot guarantee any operation.Even if it is available, the communication speed may decrease, the call or communication may be unable to be able to call, and the behavior of the terminal may be strange.If used, please use it at your responsibility.

KDDI cannot be used.

The USIM card of the SoftBank 3G contract is not available.The USIM card with the 4G LTE contract can be used as it is, and if you subscribe to the "5G basic fee" (change contract), you will be able to get a 5G network.

――Is it possible to communicate in 3G areas in Japan on 5G terminals?

Including the DoCoMo XI area, the 5G service area is expanding equivalent to FOMA (3G).We will provide a comfortable (communication) environment through Xi and 5G networks for 5G terminals.(Author Note: Of the 5G terminals of DoCoMo, the terminal with detailed specifications is posted, saying, "If you use a 5G contract, 3G communication in Japan will not be available after late May 2020.")

3G communication (in Japan) is not available because you can use a 4G LTE network that is faster and more convenient than KDDI.In addition, 4G LTE devices compatible with au VoLTE are not compatible with 3G communication (in Japan).

Softbank is possible at the moment, but it is undecided for the future.

――Is it possible to change a new contract or contract by bringing 5G terminals released by other companies, including SIM rock -free ones?

It is possible if you can confirm that it can be used as a docomo 5G device.However, we do not guarantee any operation of 5G terminals released by other companies in principle, so we cannot guarantee any operation.Please use it at your own risk.

It is possible to make a KDDI contract itself.However, as in the case of LTE -compatible SIM -free terminals, we do not guarantee the operation on non -terminals sold by our company.

Softbank is possible.If you can self -report that the terminal you use is 5G, you can join the 5G basic fee (5G plan).

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