How can I activate my simcard 2 on the Huawei y3 2018

Contact the network provider and they can unlock it for you.

You can change mac-address of SCUB on Huawei OLT MA5680T in following way:
1. First you have to login as root user
2. You will have to enter in diagnose mode with following commands:
huawei(config)#diagnose
huawei(diagnose)%
3. you have to check which mac address is currently in the system by command:
huawei(diagnose)% display sysman mac-address
Current MAC address of active mainboard: 0025-1c54-c45c
Default MAC address of active mainboard: 0025-1c54-d0763
4. Changing mac-address you can done with command:
huawei(diagnose)%sysman mac-address current 0025-1c54-c455
Command:
sysman mac-address current 0025-1c54-c455
Modifying current MAC address may cause the conflict of MAC address, are you
sure?(y/n) [n]:y
5. Last step is to reboot board on which you have change mac-address or to reboot system. In this way new mac-address will be applied to the SCUB board

Yes, Huawei SCUN main control board has uplink ports, it can deloy uplink function in theory, but this solution is not recommend, normally 2*SCUN configured in one Huawei OLT chassis, one is active, another is standby, if active board stops working, all service can be actomatically synchronize to standby board, but since not two boards both configured uplink modules, so the uplink service will be interrupted if deploy uplink function on SCUN.
In all, Huawei GICF and Huawei X2CS are the uplink board for MA5600T. Huawei SCUN boards Thunder link com

"Yes, Huawei SCUN main control board has uplink ports, it can deloy uplink function in theory, but this solution is not recommend, normally 2*SCUN configured in one Huawei OLT chassis, one is active, another is standby, if active board stops working, all service can be actomatically synchronize to standby board, but since not two boards both configured uplink modules, so the uplink service will be interrupted if deploy uplink function on SCUN.
In all, Huawei GICF and Huawei X2CS are the uplink board for MA5600T."The answer comes from a website that if you have more questions to visit their website www.thunder-link.com hopefully it will help you. Huawei MA5680T OLT Access system Thunder link com Huawei GICF Uplink Board Thunder link com

Yes, Huawei SCUN main control board has uplink ports, it can deloy uplink function in theory, but this solution is not recommend, normally 2*SCUN configured in one Huawei OLT chassis, one is active, another is standby, if active board stops working, all service can be actomatically synchronize to standby board, but since not two boards both configured uplink modules, so the uplink service will be interrupted if deploy uplink function on SCUN.
In all, Huawei GICF and Huawei X2CS are the uplink board for MA5600T.

Hi
The manual can be downloaded from the page that the link below takes you to.
http://consumer.huawei.com/en/support/manuals/detail/index.htm?id=12229
Cheers

Is your Huawei locked with any particular network and you are trying to insert some other network?If so..only if you unlock the Huawei will be able to recognize the LG simcard.I suggest you can get the unlock for your model from Mobile-unlocker.com by specifying the phone model,country,locked network.

I am not aware of a free unlock method for the mobile model that you have specified.I suggest you can use the Huawei Unlock Reset Service from Unlock-zone.com to unlock your Huawei Ascend Y300.

Return it to place of purchase for a refund/replacement, (assuming you just bought it)

Hi,
Try removing the Simcard and reloading it again.Try switching the Simcards[Simcard 1 into Simcard 2 slot and vice versa] i.e to establish if its the Simcard or the phone with a problem.Also,check the Simcard reaction on another phone.If its the Simcard,contact your service provider for further instructions on re-activation.

Hope this helps.Thanks!