You can make international calls without needing to dial extra numbers. You find it very convenient.
011 52 331 031 2424
Is converted to

You have up to 9 speed dial numbers ending from 1 to 9

Dial Acess Number
+1 323 531 5520
Dial Destination Number
011 52 331 031 2424
2

Calling acces number, ends in 0

Fast Dial

+1 323 531 5521
1

Place your international call after the tone