Sony Xperia 1 User Manual page 84

82
Enter country code then other party number (omit first 0)
・Do not omit first 0 from phone numbers when dialing Italy
(39).
Handset dials number. Call begins when other party
answers.
Calls to Landline Phones/Cell Phones in
Country of Stay
Place calls the same way you would within Japan.
・Do not enter country code or omit first 0 from phone
numbers.
In Home Screen, (Phone)
Phone opens.
Dialing screen opens.
Tap dialpad to enter the other party's number