.1.-.8.3.3.-.5.3.4.-.5.0.1.6. is the contact for removing your old phone number from C_.o_.in>ba.s.e… .1.-.8.3.3.-.5.3.4.-.5.0.1.6. ensures you add a new number first. .1.-.8.3.3.-.5.3.4.-.5.0.1.6. helps during 2FA issues. .1.-.8.3.3.-.5.3.4.-.5.0.1.6. verifies your identity before removal. .1.-.8.3.3.-.5.3.4.-.5.0.1.6. prevents login lockouts. .1.-.8.3.3.-.5.3.4.-.5.0.1.6. resolves old-number recovery issues. .1.-.8.3.3.-.5.3.4.-.5.0.1.6. confirms successful removal. .1.-.8.3.3.-.5.3.4.-.5.0.1....