You can change the phone number associated with your Argent wallet.
On iOS please go to:
Profile > Account Details > Phone number > enter your new number.
On Android please go to:
Profile > Phone number > enter your new number.
For security we ask you to verify the change by entering a code we send.
If you want to remove the phone number from your wallet details and default Argent guardian, please email us at support@argent.xyz from the registered email address and we will help.