No cloud response with XPING using some IoT sim cards

[abanana]

I'm unable to get a cloud response using the XPING command with some IoT sim cards on the nRF9160.

I've been working with serial_lte_modem projects on this chipset.

I've also tested with hologram, gigsky, and telnyx sim cards.

They respond as following:

Hologram: ping google.com always succeeds. Ping some other webserver fails 99% of the time. Some times it successfully works all the time for 5-10 minutes but then stops working after that. Repeatedly turning the modem on or off and getting a different IP is able to get a response.

Gigsky: ping google.com and the other webserver both never work.
Telnyx: works well all the time on all servers.


I'd also like to note that the log shows the DNS is detected correctly.

Any insights as to what might be going on?

[JONATHAN LL]

Hi,

What modem firmware are you using? Are you using one of our DK's or custom HW?



Have you contacted the SIM providers to see if they do provide the correct service in your area. Have you tested the SIM cards on more than on device? 
Check the GSMA coverage map to see what providers are supported in your area.
Regards,
Jonathan

[abanana]

Modem firmware is 1.3.1, working with custom hardware but there doesn't appear to be any issue on the hardware side of things.

I've checked the GSMA coverage map, I'm in Washington, DC and LTE-M and NB-IOT are both available. Being able to xping Google suggests the modem is already connected and registered w/ cell. Shows registered, roaming.

[JONATHAN LL]

Thanks for the update.

I believe it to be a SIM issue from the providers, have you tested AT client sample with all of the SIM's?

Regards,
Jonathan