@Gustav_ASUS No but I don't see what the problem could be.
When I put the ASDA Mobile sim into my old Samsung Galaxy S7 Edge. Mobile Internet works fine.
I updated to the 17.0823.2009.99 update and my mobile internet stopped working.
I test updated my mum's phone (exact same ROG Phone 3 as mine) Tested it before upgrading to the 17.0823.2009.99 update and mobile internet was working perfectly. Upon updating to the 17.0823.2009.99 update the phones mobile internet stopped working totally.
Edit to add, before updating my mums phone when her internet was still working. I swapped her simcard into my phone and in my phone it did not make the internet work. But when I put it into her phone the internet worked fime. It was at this point I did the test update on her ROG Phone 3 to 17.0823.2009.99 that I have detailed above.