Board Thread:Question and Answer/@comment-124.6.181.108-20140727144609/@comment-25133996-20140728031611

You won't lose your data if you haven't change your device. For the Insufficient Data issue, I think that you should delete your VC app and reinstall it again, this should do it. If not, try clear more space for your phone, because the phone needs some space (~150MB) for system apps or whatsoever.

At last, for safety, it is recommended to link your account with the SNS platform, either in Facebook, Twitter, Renren or Weibo. Then your account is OFFICIALLY safe, even if you crash your phone.