STEP 1 Get Google Drive.
Make sure that you have the latest version of Google Drive on your iPhone, then sign in to Drive with your Google Account.
If you don’t have a Google Account, you can create one after you download Drive.
STEP 2 Back up your stuff.
Back up your content in Google Drive. Go to Settings in Google Drive, then tap Backup. You can pick specific things to store, or do it all at once. Your choice.
STEP 3 Turn off iMessage®.
Go to Settings and turn off iMessage on your iPhone. Also turn off FaceTime®, so that you won’t miss any messages or calls once you’ve switched to Android.
STEP 4 Sign in on your new phone.
Sign in on your Android device with the same Google Account that you used during backup. And just like that, you’re in. Your backed up data will automatically be available in your Google Contacts, Calendar and Photos apps.