>If only you could put a phone permanently in airplane mode (just wifi + bluetooth enabled) in the developer settings..

One such device was the [Neo900](https://neo900.org/), which had the baseband as a separate chip that the CPU could turn off at any time. Unfortunately, development stopped sometime in 2018. It seems like they might have shipped some units to customers, but I haven't been able to confirm that for sure.

orthzar

I recommend the GL Mudi.  You can install additonal software to switch the IMEI every time you swap the sim.

If only you could put a phone permanently in airplane mode (just wifi + bluetooth enabled) in the developer settings..

tech

LTESniffer: An open-source LTE downlink/uplink eavesdropper [pdf]

THIS!!

I recommend the GL Mudi.  You can install additonal software to switch the IMEI every time you swap the sim.

If only you could put a phone permanently in airplane mode (just wifi + bluetooth enabled) in the developer settings..
