LX40 can receive SMS but can't send

AirLink Routers
1

Using p/n: 1104579 with AT&T SIM. I receive SMS in ACEManager Last Incoming Phone Number.

Quick Test says “successfully send the command” but no msg is received.

This is the 2nd modem we try with this same problem, and we also have the same problem with T-Mobile SIM. What am I doing wrong?

3

Dear @eguadalupe ,

Welcome to Sierra community!

In order to troubleshoot the problem, can you please provide answers to the following items:

  1. Which FW version is the device running? If it is not latest FW, please try to install the latest FW then recheck whether the problem is resolved?
    FW download: https://source.sierrawireless.com/resources/airlink/software_downloads/lx/lx-firmware-list/#sthash.Rzr3YZFe.dpbs

Besides, can you please share the screenshot of SMS tab in ACE Manager web? It should be at Services>SMS

Thanks

4

Firmware is already 4.15.3 and I’ve attached SMS settings screenshot

Thank you

ACEManager-SMS
ACEManager-SMS1040×926 36.2 KB

5

also Advanced settings (at default values)

ACEManager-SMS-advanced
ACEManager-SMS-advanced820×215 7.58 KB

6

I have a similar issue as described above; except I am on the Verizon network. What should the settings be to send a quick test within the USA?

7

Hi,

I am experiencing the same issue. It is on AT&T network. Is there a solution for this ?

8

Hi all, I found the solution in my case on the Verizon network. This may not apply to other networks.

I had found that when I requested a phone number change for the SIM card I was using through Verizon’s account management page, I would be able to send and receive SMS again for some time. However, every time I would use my LX40 to send SMS alarms to a defined list of recipients, it would only work for about 1 week before SMS would stop sending to all recipients. I would again request a phone number change, and it would work again for about 1 week before failing. I then decided to send an SMS message from my personal cell phone to each recipient on the list, to test. All the recipients received my SMS, except for one. One of the phone numbers on the list would auto-reply with a message stating that this number cannot receive SMS or something similar, I don’t remember the exact message. So, I have come to believe that whenever I would send a message to this one bogus number, my LX40 receiving an auto-reply over the Verizon network caused the SMS to be disabled on my SIM cards phone number. This is likely due to the fact I was sending around 250-500 sms messages each day and receiving the same number of auto-replies. Verizon denies that this has nothing to do with it, and they cannot explain why the phone number has to be changed on the SIM card to resolve the SMS not sending issue, however all I did was remove the bogus number from my recipient list and a final phone number change, and this issue is no longer present for our system. This has been working reliably now since Sept 29, 2023.

Hope this helps someone. Good luck.