Hive Reputation number could impact visibility of posts on some platforms if it drops well below 25. But nothing can stop account transfers etc. You can still post to the blockchain as well... just the interfaces would decide to not display it.
If you used peakd to create an account then you used hiveonboard to get the account they have told us they do not store the phone number or can't retrieve them. But they do it so that one person can't get more than 1 free account.