Anonymous
If you're having issues with your carrier, please make a new thread about it. Please stop with the hostility towards the GrapheneOS project and misinformation about it if you want to get help. You need to change your approach going forward if you want to participate here. We understand you're frustrated with a carrier compatibility issue you're experiencing but it doesn't justify how you're posting here.
with their provisioning or with the APN configuration they gave you. APN configuration isn't meant to need to be done manually and it all works fine out-of-the-box with the vast majority of carriers / SIMs. We use the same APN and carrier configuration database as the stock Pixel OS via our own carrier settings app and carrier compatibility is nearly identical to the stock OS. If there's an issue with it on GrapheneOS, it likely also occurs with the stock Pixel OS.
Very few people have issues with carrier compatibility and it's nearly the same as the stock Pixel OS in that regard. If your SIM doesn't work with GrapheneOS out-of-the-box, it likely doesn't work with the stock Pixel OS out-of-the-box either since we import their APN and carrier configuration databases. It's likely caused by an issue on the carrier's end. They may publish the wrong APN configuration. Carrier compatibility issues are rarely bugs but rather lack of complete carrier configuration database entries for a carrier to properly work around their quirks. Carriers are responsible for submitting this information to AOSP. Most don't submit it for AOSP which is why we use the Pixel databases instead of the AOSP ones.
GrapheneOS is not based on the stock Pixel OS. Both GrapheneOS and the stock Pixel OS are based on the Android Open Source Project. GrapheneOS primarily adds privacy and security features to AOSP along with alternatives to integrating privileged Google Play and other Google apps. Stock Pixel OS doesn't modify the AOSP code but rather adds and replaces many components with their own and configures parts of it differently. Neither of them does an extensive overhaul which is why they're so similar. GrapheneOS is not a modification of the stock Pixel OS.
It's not clear what you mean about permissions and you're likely misunderstanding how permissions work. Viewing "All permissions" is a list of access that the app is able to request, not what it can access, and it seems you must be misinterpreting that as something it isn't. If you made threads asking questions instead of making attacks based on assumptions, you could learn from the answers. The hostile approach isn't going to lead anywhere positive.
Please stick to the topic of threads.