Sony Xperia Z smartphones come with an integrated voicemail feature called the Xperia Answering Machine. Once enabled, this feature can respond to incoming calls with a greeting message you have recorded beforehand, and also records the callers' messages on your smartphone. Here's how to configure the Xperia Answering Machine on your smartphone:
Go to Apps > Settings > Calls:
Go to Other Call Settings and then tap on Xperia Answering Machine:
The first step is to record a greeting message. Tap on Greetings > Record:
You can now enable the Answering Machine option:
By default the Answering Machine activates after 13 seconds, tap on Pick up after to change this setting.