Several mobile phones - both old and new, use Google Sync to transfer contacts from one mobile phone to another. That will not be possible for new users from January 30, 2013 onwards. However, all existing Google Sync connections will continue to function. People who are using Google Sync on a regular basis will not be affected by this. Only new users who wish to set up Google Sync for Gmail, Calendar or Contacts will not be able to do so.
Google has also announced that it will discontinue Google Sync for Nokia S60 project on the same day- January 30. Along with that, the small number of mobile phones using SyncML, mostly Nokia and Sony Ericsson smartphones, will not be able to use the service from January 30 onwards. By axing Google Sync for several mobile phones, portable devices and tablets, Google is in some ways moving away from the Microsoft Exchange ActiveSync protocol. Google now recommends that consumers use the IMAP (Internet Message Access Protocol) for Gmail, CalDAV protocol for Calendar and CardDAV protocol for Contacts. That means three different protocols for three different services, and it certainly looks better from the security point of view. Existing users of the Google Sync service will face no issues till or post January 30. However, after that new users will have to use the specific protocols for syncing email, calendar and contacts with Google.