RUT240 running firmware 7.02.4. This also occurred on firmware 7.02.2. When sending the SMS command 'cellular apn=internet', the command is not executed. The SMS is not visible in 'read messages' (as it would be if it was incorrect), but the command is not being executed. I can set the APN in the GUI fine, but cant set it via SMS. Other SMS such as 'status' are working.
I tried this possible solution, but it didnt make any difference:
Please follow these steps in order to solve this issue:
1) Enable auto APN and save the configuration;
2) Wait until device receives some IP address;
3) Disable Auto APN, add custom APN and save configuration.
I also tried setting it via UCI, but the luci-reload command fails (and is seen in the 'read messages' section:
uci set simcard.sim1.apn='yourapn'