How does Sony Ericsson mt 15i get short messages to the home screen quickly?

You mean to move the icon of SMS to the home screen? Or open the message content directly on the home screen after receiving the message?

First question: Just press and hold the SMS icon and pull to the home screen.

The second question: you need to install a third-party SMS software, which is set to open the received SMS directly on the home screen. Recommended use: Manual SMS or GO SMS.

(You can also use third-party SMS software to open widgets. There are some SMS plug-ins on the home screen. Try it yourself. )