ContactSync

ContactSync allows you to synchronize your phone book with contacts in your Google account. There is no need of creating special Google accounts in your phone. All you need to know is your Google contacts username and password. The app would send your phone contacts to Google and would transfer your Google accounts to your phone. It would not delete any existing information in your destination and would correctly update the existing account with new information. The app is capable of synchronizing groups and creating any new group in the phone or Google account.

*** Please note that in the Free version there is a limit of 20 contacts that can be transferred at one time. You can buy the Pro version which is ad free and does not have any limitation.