Hi Majas
Let me be the first to officially welcome you to the eForum, you're part of the family now
There is loads of information around this error code on the forum and I’ve managed to track a thread with some really useful information and fixes on there for you to try, just simply follow the link:
Error Code 635 Vodafone Mobile Internet
You can also type in 635 in the search box, this will search the forum for even more around this error code.
You know where to come if there’s anything else
Matthew
eForum Team