What would the phone to accept any sim card must be reset by the operator. Unlocking is done by phone IMEI Beeline Smart 3 special code which is calculated on the basis of this same IMEI and is unique to each phone.
Before applying, make sure that when you install a foreign sim card phone requests a security code. Carefully write down the phone IMEI, there is an error in one digit and the resulting code does not fit. IMEI can be found under the battery or by typing in the dialer combination * # 06 #.