Can A 3G Mobile Phone Upgrade To A 4G Mobile Phone; Does The 4G Network Consume Too Much Traffic; If 3G Card Change To 4G Card, Will Change The Phone Number Or Not; I Use A 3G Card Now, If I Want To Use 4G Network, Must I Change The Card - Huawei GR3 Faq Manual

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Can a 3G mobile phone upgrade to a 4G mobile phone?

Can NOT.
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Does the 4G network consume too much traffic?

The data transmission speed of the 4G network is much higher than that of the 3G
network. But the traffic consumption depends on the user data usage instead of the
networks.
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If 3G card change to 4G card, will change the phone number or not?

For specific details, please consult your network provider.
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I use a 3G card now, if I want to use 4G network, must I change the card?

For specific details, please consult your network provider.
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4G mobile phone shows the 3G signal.
Please make sure whether the SIM card you use is a 4G card. If not, please change.
Otherwise, when 4G signal goes wrong or 4G network not covered, the mobile phone
will switch to the 3G signal automatically.
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Can a 4G phone use the 3G card?

Yes, your mobile phone can use the 3G card provided by the same service provider.
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Why can't access the 4G network?

Ensure that the following conditions are satisfied:
Your mobile phone supports for the 4G network.
The SIM card is a 4G card.
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