It should be noted that the procedure and conditions for changing mobile operator is almost the same for all.
How to change operator preserving number: transition to the Beeline
You must come to the Beeline office, to inform about the intention to change mobile operator, and then to complete a questionnaire which will give you (need passport details). You will be given an additional SIM card and you will be able to use both cards.
On the day of the change cellular phone company can appear a problem with the network (it is better to err and to consider how you will communicate and resolve issues, acquire new SIM card). It should be noted that the change of a mobile operator should occur no later than 30 days from the date of writing the application.
How to change operator preserving number: transition to MTS
You must come to the MTS office to inform about the intention to change mobile operator, and then to complete a questionnaire which will give you (need passport details).
After issuance of new SIM card you will be able to use your old card, approximately one day prior to the change of operator, you'll receive a notice and you will have to insert in the phone is issued the SIM card.
It should be noted that the transition paid, so if your account is in arrears and less than 100 rubles (100 rubles - the cost of transition), the shift operator will be denied.
How to change operator preserving number: transition to a Megaphone
You must come to the office Megaphone, to inform about the intention to change mobile operator, and then to fill in the questionnaire that you will give. After filling all the fields in the questionnaire you will be given a new SIM card, the day before the change of operator will receive a message with this notification.
The migration cost is 100, the transition time is not more than 30 days.
The transfer may be denied for the reason that it hasn't been 60 days since the previous change of the cellular operator.