I went through the Z10's user guide, it is located in yout BlackBerry Hub - http://docs.blackberry.com/en/smartphone_users/deliverables/51998/BlackBerry_Z10_Smartphone-User_Guide-1355507367919-10.1-en.pdf
If you still have difficulty locating the SIM Menu - please Tweet @talk2Globe, they are available 24/7.
Hope this helps.
Thanks! It's not in my hub as suggested by the user guide. I tweeted Globe, they told me to just dial *143#
I still find comfort in seeing the sim menu as part of the phone's menu though.
Anyway, Thanks for the time answering my question.
This is not how will you find the postpaid menu service on your device..
but to give you other option.
you can download the gservices application on you phone which also works like the postpaid menu in the sim services.
pls check this link:
Wow! How did your friend do it? I tried searching it in BlackBerry World but I didn't see it.