@Kevin_Z Thank you for your reply.

I used on both Web UI and tpMiFi app to check the SMS

and I did not try another SIM yet.

by the way, I did the hard reset already, it was the same.

Let me try another SIM and I will let you know.

Thank you again.

@Kevin_Z I tried the new SIM, I still cannot read SMS.

I tried reset all settings (again), it is still not working.

another solution?

@Korkiat @Kevin_Z 

I just received a brand new M7450 today and have experienced the same issue - I've tried multiple devices (iphone, ipad, pc) via both the app and the web browser and I get the same errors described above.  There is obviously some issue here? Any support would be greatly appreciated.

Michael

@Korkiat @Kevin_Z  I am experiencing the same issue, it used to work just fine. Have tried upgrading firmware but the device is up to date. Any help please?

I know some behavior to get this problem.

some SMSs were sent from operator which contains some character which tp-link cannot read it (i guess).

scenario 1.

let assume the first load inbox list is 3 items

1. SMS3

2. SMS2

3. SMS1 <-- failed SMS

from the above scenario, you will get the "Failed" when you tap the "inbox" and you cannot read any SMSs

scenario 2

from the scenario 1, when there is a new SMS coming to this app

1. SMS4

2. SMS3

3. SMS2

next page

1. SMS1 <-- failed SMS

from the above scenario, you can get into the first page of SMS list and you can read the SMS from SMS2-4. once you reload for more SMS for SMS1, it failed anyway.