The easiest way is to store your contacts in your Google Account. This way, you can simply sign in to your Google Account on your new phone and your contacts will be synced to your phone.
Other ways for transferring contacts include:
- Sync with your computer: Sync the contacts from your old phone to your computer, and then use HTC Sync Manager to sync your phone with your computer's Microsoft Outlook, Outlook Express or Windows Contacts.
- Social network accounts: Log in to your favorite social networks to import contact information from them.
- SIM card: Import all your SIM contacts to your phone.
- Microsoft Exchange ActiveSync: Sync your work contacts from the Microsoft Exchange ActiveSync Server in your workplace.