I had the same problem when i inserted a new sim. And it was solved by deleting those folders mentioned in the below post and re configuring the APN. I think just putting some other sim card in your phone might also help. Just try inserting another sim card , see if it gets connected to internet and then put your sim card back. I solved it by deleting the directory as shown in the below post

https://together.jolla.com/question/...cher-grey-out/