A phone doesnt need a sim to connect to the network towers. Sim is only for billing. The network can see your imei and triangulate your location as long as your radio is on.
I have read this on https://discuss.grapheneos.org/d/7710-changing-imei/8, but I’m bit confused. Does this mean our IMEI is identified by cell tower as long as the airplane mode is off? What exact setting is “Radio” referring to?
Short answer: Yes The network can see your IMEI and triangulate your location even though no SIM is installed. and theoretically with airplane mode off no radio is on
The radios are the parts of your phone that communicate wirelessly. Most phones will only turn the cell radio off entirely during airplane mode, disabling mobile data does not typically turn that radio off.
Airplane mode should turn everything off (unless you re-enable things like WiFi, but that should still keep the cell radio off)
It shouldn’t be, no. But one of the big problems with phones currently is that the radio firmware is almost always a closed-source binary blob.
Airplane mode is probably better understood as the OS asking the radio nicely to not attempt to communicate with the outside world. The antenna is still there able to receive signals, and the radio technically doesn’t have to listen to the OS if it doesn’t want to.
It’s incredibly unlikely (researchers look for this kind of thing), so make sure your tin foil is on tight, but not impossible that a radio could store cell tower identifiers it has seen whilst on airplane mode and do something with them when it is allowed to communicate again. There’s also the possibility there’s some secret signal that can be sent to force a phone in airplane mode to respond.
Unless you’re up to some Edward Snowdon level stuff though, even if that last one exists, it’s probably not being used on you.
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The radios are the parts of your phone that communicate wirelessly. Most phones will only turn the cell radio off entirely during airplane mode, disabling mobile data does not typically turn that radio off.
Airplane mode should turn everything off (unless you re-enable things like WiFi, but that should still keep the cell radio off)
I can use WIFI with Airplane mode, is my IMEI being transferred to any place in this situation?
It shouldn’t be, no. But one of the big problems with phones currently is that the radio firmware is almost always a closed-source binary blob.
Airplane mode is probably better understood as the OS asking the radio nicely to not attempt to communicate with the outside world. The antenna is still there able to receive signals, and the radio technically doesn’t have to listen to the OS if it doesn’t want to.
It’s incredibly unlikely (researchers look for this kind of thing), so make sure your tin foil is on tight, but not impossible that a radio could store cell tower identifiers it has seen whilst on airplane mode and do something with them when it is allowed to communicate again. There’s also the possibility there’s some secret signal that can be sent to force a phone in airplane mode to respond.
Unless you’re up to some Edward Snowdon level stuff though, even if that last one exists, it’s probably not being used on you.
thanks a lot!