All Plivo phone numbers are held in an inactivity pool for a 3 months period before it is made available to buy. During this time, inactive phone numbers are blocked and do not appear in phone number searches.
It is possible to get back an un-rented phone number if
your phone numbers have been unrented within 30 days, or
if the phone number has not yet been rented by another Plivo user,
Please note that there are circumstances where carriers have recalled phone numbers prior to the 30 day inactivity period, in which case, we will not be able to recover your un-rented phone number.
However, to request an un-rented phone number to be added back to your account, please create a support ticket and indicate the phone numbers in question and our Phone Number procurement team will try to retrieve the phone numbers for you.