In previous releases we have particularly described mobile number portability and associated with it uninterrupted receipt of SMS messages by cardholders about performed operations. Currently, we have improved our service and receipt of one-time password by cardholders to confirm operations while changing mobile operator is unproblematic now. To do this, the client needs to make only one simple step – send a message CHANGE OTP [operator] to the short number 8893. We would like to note that the parameter [operator] is a variable for Azercell, Bakcell, Nar and Narmobile.