can anybody help me on this ?

[bad_situation]

i am from the United Arab Emirates ......Etisalat is the only operator for our country i am not that much good in this feild but i am interested and i am working as a network administrator anyway i would like to clone my sim card where i bought from my operator and i wana some answers to my quision

first

i understand the the imsi and ki code are in the sim card and encyrepted and for example sim master 3 can read them from a sim card unless the operators change the algorythm and its since 2002 anyway what i wana know is now when i am calling some body my number shows in his screen that i am calling and this number is identifing me now my phone number who people use to call me on is the imsi or the ki ????? .......and if i wana call with a fake ID what do you thing shall i change is it the ki or the imsi and thanx .....by the way people i am now going through a new project which is implementing smart cards as loging and in the same time having your private keys for dycreption ....i know that smart card is different than sim but at the end they are readers which reads from the both anyway hope to find an answer and thanx alot