You can add a phone number to an address, or modify the existing one. If you do this, you are able to call or send an SMS to the receiver of the package. You can find the explanation below.
In the list screen, tap on an address to add or change the phone number
Tap on ADD PHONE NUMBER
Fill in an existing phone number, and tap OK
The address now contains the number you just filled in.
By clicking on the same address again, you see that the edit screen has changed. You can now choose to MODIFY the number if you so desire, or call/SMS it instead.
IBI has special SMS features, which you can find more about in the IBI SMS manual page.
