Etisalat (Govt owned- same as QTEL) they offered same ETISALAT numbers to customers who were willing to keep both mobile numbers .. I had du and Etisalat same numbers but their codes were different:
du: 055 - 1234567
Etisalat : 050 - 1234567

so if this is the case then sure du will come up with code dialing numbers.. then I will keep both numbers or else i will use the number service which is cheaper for me.