The biggest star is Star Baidlgurs .

The largest non-variable star, whose size we can be reasonably sure of, is VY Canis Majoris, but there are almost certainly many in the Milky Way that we cannot see (or whose size we cannot determine) that are larger. Wiki lists UY Scuti  as the largest, but this assessment is the subject of some controversy.

Could only find a little about it but most messages that have been deleted are gone ! Unless they have been archived like regular e-mail. Maybe this video might help.

I have use GT Recovery for Windows to recover deleted messages form messenge, it doesn't need to root my phone