Don't be worried if your MyBT goes through some rather odd statements as the changeover happens. They may have fixed it now, but for many of us it said 'No phone - No Broadband' for a few hours. Also, the actual benefits (unthrottling, and the dubious benefit of 50GB Cloud) can take a few days to get through their baroque processes after the new package starts.
Moved (with trepidation turned relief) to BT Infinity 2 for upload speed. Happy BE user for several years.