Cancel HTC and Google Sync

Question

Google

Tell me, there is an HTC phone with Android. Created a Gmail account, set up synchronization with Google Sync. Moved to iPhone 4, set up Google Sync synchronization. I want to sell HTC, but when I try to delete the sync account in the settings, Android offers to delete the data on Google servers as well. How to safely unsync contacts and calendars without deleting data on the phone?

Answer 1

Do a hard reset before selling.