Hi, Thank you for the responses. To clarify I haven't tried to install GOS on my new 7a yet, I installed easily on my 6a last year (a lot easier than Samsung/twrp/lineage). I was just trying to find out if anyone had managed/not managed to install on a Tesco phone?
I was worried/confused about the following passage in the installation notes:
You need one of the officially supported devices. To make sure that the device can be unlocked to install GrapheneOS, avoid carrier variants of the devices. Carrier variants of Pixels use the same stock OS and firmware with a non-zero carrier id flashed onto the persist partition in the factory. The carrier id activates carrier-specific configuration in the stock OS including disabling carrier and bootloader unlocking. The carrier may be able to remotely disable this, but their support staff may not be aware and they probably won't do it. Get a carrier agnostic device to avoid the risk and potential hassle. If you CAN figure out a way to unlock a carrier device, it isn't a problem as GrapheneOS can just ignore the carrier id and the hardware is the same.
I have just enabled developer mode and OEM unlocking so does that mean the installation will work fine even though the device is probably locked to a specific carrier?