IDrive Lite allows you to backup, share and restore all your iPhone contacts completely free of charge if you’ve updated your iPhone software to 2.0. Once the app is installed on your iPhone, you can tap the ‘Backup’ button and the tool will automatically save your contact information to IDrive servers online. No signups required. You can easily restore contacts as well without overwriting people you’ve added after your last backup. Finally, the sharing functionality is rather nice; it lets you share information with other contacts in your address book by sending them an SMS with an import key for them to use. iDrive Lite next versions will have Photo backups, Mail backups, Application setting backups etc.
IDrive Lite – iTunes Link || No Registration required
Funambol - iPhone mobile sync client is free software that makes it easy to wirelessly migrate and sync contacts between your iPhone and older phones as well as webmail systems and email clients such as Outlook and Thunderbird. It provides a great way to back up your iPhone contacts and to keep your contacts in sync. Funambol doesn’t have the share feature. It’s always worked fine for me, and also has a web-based version and Outlook plug-in, making it much easier to manage your contacts.
Google Sync – Google Sync for iPhone is a free service that synchronizes the built-in calendar and contacts on your iPhone with your Google account using Microsoft Exchange ActiveSync protocol. It even lets you view multiple Calendars in different colors. It’ll keep you Always in sync. Your calendar and contacts stay synchronized whether you access them from your iPhone or from your computer. Add or edit contacts or calendar entries right on your device or on your Google account on the web. Just Note of Caution – During Sync setup, the iPhone will delete your existing contacts and calendar information.
My.memova is a handy contacts syncing and backup service. With the my.memova service, safely store your iPhone and iPod Touch contacts online. Other great features include the ability to transfer address books between several phones, manage, organize and keep your address books synchronized, plus import and export to and from other address books like Gmail, Hotmail, Yahoo! and Microsoft Outlook.
MobileMe is a paid service from Apple, that automatically syncs your email, contacts, and calendar to your iPhone, iPod touch, Mac, and PC. Access your email, contacts, calendar, photos, and documents from anywhere with a ad-free web applications at me.com. Use MobileMe Gallery to share photos with friends and family in a stunning online gallery. An individual membership comes with 20GB of combined email and file storage, 200GB of monthly data transfer, and full access to everything MobileMe has to offer. A 60 day trial is offered in Apple site. And can purchase it for 69$ from Amazon.com or 99$ from Apple store.