gos79732 As Probably9857 said, IMEI is still recorded by cell towers even without a SIM. See https://discuss.grapheneos.org/d/2509-are-cell-identifiers-leaked-on-first-android-boot-before-installing-grapheneos. More discussions:
https://discuss.grapheneos.org/d/9874-is-phone-trackable-without-a-sim-card
https://discuss.grapheneos.org/d/19535-does-imei-get-sent-to-towers-on-gos-without-a-sim
There is unconfirmed speculation that there could be a small amount of Bluetooth radio activity at during boot for both stock Android and GrapheneOS. If this is true, it's unclear what this activity is and what identifiers are involved. See https://discuss.grapheneos.org/d/26586-brief-note-on-mobile-phone-measurements-with-airplane-mode-onoff and https://github.com/GrapheneOS/os-issue-tracker/issues/6469.
gos79732 Thank you for the links. They were very informative reads.
gos79732 While recommended as a best practice, this is not required. From the Web installer guide:
gos79732 The Pixel 6a is the only phone that requires an update before installation, as documented later in that same guide:
Okay, I understand. Thanks for providing all the context.
gos79732 A stock OS update can take a long time to install, especially if downloading over a slow connection. I never updated the stock OS and I haven't had issues installing GrapheneOS on a new Pixel device. Stock OS collects telemetry data, so you may want to minimize how long the stock OS is running.
I got it. The research paper/study is interesting.
gos79732 ou're going to need to connect some device to the phone to ultimately perform the installation. Both stock Android and operating systems such as Windows collect lots of telemetry. It's possible that USB identifiers from your computer or phone are collected by the other and stored remotely. That's something to be aware of if this is a concern. See https://discuss.grapheneos.org/d/27314-privacy-risk-of-booting-on-an-idd-device. If using a laptop, booting a live Linux distro is an option.
I wasn't worried about connecting the phone to the laptop. I didn't think about that before. I am on a Mac still unfortunately. My only option would be to go to a library and boot a live Linux distro. This may be not as necessary?
gos79732 Starbucks Wi-Fi typically requires a name, e-mail, etc. to connect. You can provide alias information, but be aware of what you provide and how it is associated to you if this is a concern.
That's a great point.
gos79732 The Web installer requires you to download the GrapheneOS image, which is almost 2 GB. The installation image cannot be downloaded ahead of time with the Web installer. The download will take a long time from a slow internet connection. If using public Wi-Fi, you may want to speed test the network ahead of time so you're not stuck in the middle of an installation waiting for hours to download the file. It is possible to download the image ahead of time with the CLI installer, but the Web installer is much easier to use.
This is really good to know!
gos79732 Once GrapheneOS is installed, it will boot with factory settings with airplane mode off. This means the phone will connect to cell towers again until airplane mode is enabled.
Okay!
gos79732 This step is now integrated into the initial setup during installation: https://grapheneos.org/install/web#disabling-oem-unlocking. This no longer needs to be done through Developer Options.
Cool! Thanks again!
gos79732 A portable hotspot device has an IMEI and will allow tracking of your location. I'm sure you're aware of that, but it's unclear what you gain by using a portable hotspot instead of a data SIM in your GrapheneOS phone.
The device does have an IMEI and it has an E-SIM. I can change the ESIM carrier from plan to plan to not rely on 1 carrier get my data. I looked into ESIM carriers that take Monero, there are a few but they were more expensive. I will switch to them later next year.
The main benefit of using a SIM in an external device vs inside the phone is that the SIM collects as much telemetry data as possible and sends to cell towers. On a hotspot device, the info that the ESIM has is minimal or negligible compared to a SIM inside a phone. Now, the argument is not as strong on Graphene compared to Android or iOS but my understanding is that, it still stands.