Can end up calling the Dubai number and getting someone to answer telling you that X that you called is not in Dubai for example.. you'd waste an international call because of that!
when I call someone, if I tap on the picture it displays the list of numbers from that person, and shows in blue the number I'm calling. Also, I can tap on all my calls and see what was the number I was calling or the number that each person use to call me. Of couse, It will be good to display the number at the bottom of the picture before you answer.
Say I had 3 phone calls from the same person, One office phone, one cellular and one international... all will appear the same in the call log... i will have to individually check each one of them by tapping once .. because they all look the same...
it's manageable but god it needs an alert mind, u cant do that while half asleep 5 AM in the morning
Can end up calling the Dubai number and getting someone to answer telling you that X that you called is not in Dubai for example.. you'd waste an international call because of that!
what your asking is something that only a network provider can give to you but i don't think any networks provider will give you a privilege to pinpoint someone location when answering a call...that considering as spying on someone...
just need to see their number to know the country code 
.... thats pretty basic telephony