search

botletics / SIM7000-LTE-Shield

Botletics SIM7000 LTE CAT-M1/NB-IoT Shield for Arduino
https://www.botletics.com/products/sim7000-shield
GNU General Public License v3.0
477 stars 215 forks source link

SIM7000G with T-Mobile 2G #124

Closed cszuo closed 4 years ago

cszuo commented 4 years ago

I got a SIM7000G from amazon. The reason I purchase SIM7000G instead of SIM7000A is that it can work for both IoT network(NB-IoT,CAT-M) and 2G. It works great with hologram IoT SIM card. But it doesn't work with my T-Mobile SIM card from my phone. First of all, I have tested that my SIM card can work under GSM(2G) with module A9G there is not problem to send data or SMS. So this SIM7000G should work with GSM card, I have tried AT command like AT+CNMP=13 which will case the module keep rebooting after few seconds. Also tried to set APN (AT+CGDCONT=1,"IP","t-mobile" and AT+CGDCONT=1,"IP","fast.t-mobile.com") like what I did for the A9G module, but still doesn't work.

So, does SIM7000G support 2G in USA, it looks like they can connect to 2G. Or did I missed any AT commands? BTW, I don't have Arduino, so I use AT command only. Thank you.

botletics commented 4 years ago

I think 2G is no longer supported by T-Mobile. The main reason of using the SIM7000 in the US is to utilize LTE CAT-M or NB-IoT

cszuo commented 4 years ago

I am pretty sure 2G is working in my area by T-Mobile as I have successfully used it with GPRS module A9G.

Another problem is I am not able to use SIM7000G to receive SMS from Hologram, but I can receive SMS with SIM7000A. Do you have any idea?

botletics commented 4 years ago

Hmmm I'm not sure about the 2G. I think they're at least discontinuing it on 2020.

If you can't connect to the network you won't receive SMS, which makes sense. But if you were connected, perhaps on the SIM7000G you were connected to Verizon. Try using setBandPreference() with band 12 to force it to AT&T. Some users have reported that on Verizon SMS aren't received properly.