I recently purchased the raspberry pi 4g kit with EC25-A(north america) modem. So far everything looks good. Im looking for an easy way to temporarily disable the modem because it takes priority over wifi and I want to switch to wifi when available to save data $$$. Im not a linux wiz or networking wiz so rather than try to change the priority of network interfaces I opted to just disable the device with a simple command line or a bash when needed.
I am interested in either sleep more or airplane mode opposed to power down since it seems like a less complex operation. Based on my experience with my cell I opted to try airplane mode. On the raspberry pi I execute the command to toggle GPIO.19 from low/high and I verify with my oscilloscope. However I see no effect on cellular/data reception. I also tried to toggle the GPIO.19 visa versa but still no effect. I checked the AT+CFUN state which is always 1. Based on the documents I shouldn’t need to alter the AT+CFUN state to disable the radio, only need to toggle W_disable. Am I miss understanding what Airplane mode means? I shouldn’t be able to access internet if Airplane mode is enabled, right? What am I missing?