It is possible to have an unlimited number of phone numbers associated with your Personal Area. However, a limit of up to 5 phone numbers can be added per Personal Area per day and this limit is related to the number of verification SMS sent daily. This ensures that our system can efficiently process the large amounts of SMS requests received.
Note that even if a phone number is not successfully verified, the attempt counts towards the daily limit of 5 as an SMS will be sent in the process. If you delete a phone number and add another in its place, this action also counts towards the daily limit as it requires SMS verification to complete.