I have a Samsung S6 with Google calendar app. I have 2 google accounts and want to change from one account (the one set as default) to my other account so my Google calendar on my PC syncs with my google calendar on my S6 android. If I delete my account on my android, how can I figure out what information and contacts will be deleted from my phone prior to deleting the default account and how do I install my preferred google account on my android?