☎ In order to change your phone number please log in to the Client office -> My Profile -> Profile data.
For security reasons, changing a phone number requires additional verification. If you have access to your old phone number, we will send you SMS code. Verification code will allow you to complete the process of changing your phone number.
If you no longer have access to the phone number please contact our Customer Support to change the number manually. (https://www.xtb.com/en/why-xtb/contact)