I currently have a phone + mobile number through work, but also have an old number that I rarely use but would like to keep since I won't get to keep the work number when\if I move on. I generally top it up $20 a year to keep it "current" (and occasionally use it for data when away on holiday)

Current credit expired at the beginning of July (I think) but I forgot to top it up.  The number still shows on my account page when I login to manage my account on the vodafone site - Does this mean I still "own" the number and so can still top it up to keep it current?   Sorry I just don't want to top it up if it's actually "expired" if that makes sense.