Connector lets your contacts share their contact details with you, and saves them directly into your Google account.
When your contacts make changes to their details (such as when someone gets a new phone or changes address), Connector updates your Google account automatically.
You can share your contact details back. Connector allows you to choose which details you want to share, depending on the person you are sharing with.
Connector is a free service, and very easy to get started. All you need is a Google account!