Cannot press call button to call out from contact app. As checked, each contact name got 2 phone numbers.

I cannot press call button from contact app to call out. even i have used contact app to sync only from icloud. I still cannot press call button to call out. as I checked deeper, each contact name has two same phone number (one number as "phone" and another one as "work/mobile/home....) so it seems iphone doesn't know which number should be dialed so if i choose to call out from "work/mobile/home....", next time, the call button will be changed button's name to work/mobile/home button and then it can call out from one touch on next time. however, if I choose to call out from "phone" number, it can't call out at all.

so my question is how can I make the iphone to show only one number. I have log in to icloud in computer to see each contact, it's strange that i can see only one number and named as "work/mobile/home...etc)....

pls see picture #1 - show 2 phone numbers\

#2 - if press call from phone button, it cannot call out at all.

#3 - if press call from "work/mobile/home.... etc", it can call out and the button will be changed to work/mobile/home.. button and i can press call from this button in next time without any problems.

but it will be very troublesome to do for every contacts.....

anyone, pls help.

[Edited by Moderator]