Yes, you can use the same old cellphone number that was used during the last application period to reapply for the r350 relief grant. Your cellphone number must belong to you and you must have access to it at all times to receive any one-time pin that will be sent to you.
New application periods opened by Sassa will allow you to reapply using the old phone number that you used before. This is because the application submitted is no longer in force since the period has expired.
Currently, the period from April 2022 to March 2023 is over for application periods and so for the new budget set for the agency, Sassa will announce if they will require new submissions or if they will just extend the r350.
Allowing for new submissions makes it easier for Sassa to weed out the fraudulent applicants who are looking to rip the system off and act as a way to seive the ones who do not qualify anymore since they once qualified for it from the ones who actually need it.