Certain SIM cards don't work on TL-MR6400?

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Certain SIM cards don't work on TL-MR6400?
Certain SIM cards don't work on TL-MR6400?
2021-08-17 13:58:50 - last edited 2021-08-20 01:55:05
Model: TL-MR6400
Hardware Version:
Firmware Version:

I've had TL-MR6400 for almost three months now--it was working perfectly but noticed today that the device frequently (every 5-10 minutes) disconnects and reconnects to the internet. It became worse as the day progressed.

 

I used the same SIM card (the one not working on the router) on a mobile phone, and it worked. Then I tried using another SIM card (from another carrier) on the router and it was working fine.

 

So this particular SIM card suddenly doesn't work on the router.

 

Does this sound like a router issue, a SIM card issue, or a carrier issue?

 

Router was updated to the latest firmware.

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Re:Certain SIM cards don't work on TL-MR6400?-Solution
2021-08-19 07:17:48 - last edited 2021-08-20 01:55:05

@marcusaurelius 

Hi, what is the SIM card provider of the first one?

May I know the hardware and firmware version of the TL-MR6400?

At the same time, please check whether the 4G band would keep switching from one to another, if yes, you could have a look at this link to fix the 4G band:

[Troubleshooting] LTE keeps disconnecting

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Re:Certain SIM cards don't work on TL-MR6400?-Solution
2021-08-19 07:17:48 - last edited 2021-08-20 01:55:05

@marcusaurelius 

Hi, what is the SIM card provider of the first one?

May I know the hardware and firmware version of the TL-MR6400?

At the same time, please check whether the 4G band would keep switching from one to another, if yes, you could have a look at this link to fix the 4G band:

[Troubleshooting] LTE keeps disconnecting

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Re:Certain SIM cards don't work on TL-MR6400?
2021-08-19 10:01:11

@TP-Link Yes, it was the 4G band. Luckily I found the same link you posted and installed the beta firmware. Had to manually change it and it's working now. Cheers

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