Huawei Maimang 6 can't use 4G network. What happened?

1, SIM card problem

If your SIM card is cut, expired, and the 4G service and special SIM card are not enabled, your mobile phone may not be able to use the 4G network or display 4G signals.

Solution:

If it is card cutting, please replace the standard SIM card.

If the mobile phone card is in arrears, please pay before using it.

If the 4G service is not enabled on the mobile phone card, please replace the 4G card supporting the 4G network and ensure that the 4G service is enabled. Please consult the operator for details.

If it is a special SIM card, we have found some mobile cards that can only be used for surfing the Internet, and there are some restrictions on the use of 4G. For example, a mobile card of China Unicom needs to be manually modified before it can be used, and a mobile card of China Telecom can only be used on the mobile phone where the card is inserted for the first time, but it cannot be used when the mobile phone is changed. For the use of special mobile cards, please consult the operator about how to use them.

2, the operator problem

If you use a mobile phone customized by the operator and there is no local 4G network, your mobile phone may not be able to use 4G network or display 4G signals.

Solution:

If you use a mobile phone customized by an operator, some mobile phones can only use the SIM card of the corresponding operator. For example, some customized telecom versions only support using telecom cards to use telecom 4G, while using Unicom cards cannot use Unicom 4G. Please use the calling card of the corresponding operator at this time.

If there is no local 4G network, please consult the operator for details.

3. Mobile phone case problem

If the mobile phone is protected by a metal case, because the metal can shield the signal, it may interfere with the signal, so that the mobile phone cannot use the 4G network or display the 4G signal.

Solution:

Please take off the metal protective sleeve and try again. If the signal returns to normal, I suggest you change a protective cover.

3, mobile phone settings

If you make a mistake in the settings of your mobile phone, it may interfere with the signal, so that your mobile phone cannot use the 4G network or display the 4G signal.

Solution:

Go to Settings > Wireless and Network > Mobile Network > Enable 4G (some mobile customized models have no 4G switch, and the system turns on 4G by default), and make sure that the 4G switch of the mobile phone is turned on.

Go to settings > wireless and network > mobile network, and set the network mode to 4G/3G/2G (some models or EMUI versions do not have this setting).

Remarks:

1. Dual-card 4G models are not supported, and the secondary card cannot use 4G (please refer to FA's Related Issues of Dual-card 4G Dual VOLTE for specific models). You can choose which card is a 4G card by switching between the primary and secondary cards.

2. It is normal that the related operator's VOLTE service is not opened, and the call will fall back to 2G/3G signal.