Migrate from Sony Ericsson W810i to Galaxy
Method 1. The base way is to sync your contacts to your Gmail account from your Sony Ericsson W810i if that is possible. Then sync that account to your Galaxy and your contacts will be copied OTA easily.

Method 2. Sync all your contacts from your Sony Ericsson to Outlook. Then export those contacts from outlook to a CSV file. Once you have your contacts in CSV file you can import that CSV file to your Gmail account and then sync that Gmail account to your Galaxy S 2 and you are DONE.