Re: Switch from iPhone to Galaxy
Switching from iPhone to Android isn't all that bad, it just takes some prep work to begin using the google services instead of the Apple services. I just switched from the iPhone 5S as I've passed on both the 6 and 6S because I was getting tired of the same ecosystem. Because of that, I started planning ahead to make the switch easier if I did. Also the use of Google services work on both iPhones and Androids so you can continue using your iPhone if you decide not to make the switch, but you are not completely locked into a single ecosystem.
1) Contacts - Export your contacts from iCloud to Google.
How To Transfer Contacts From iPhone To Android (5 Ways) | Ubergizmo
2) Calendar - Export your calendar or calendars from iCloud to Google
https://discussions.apple.com/message/21296474#21296474
3) iTunes - You can sync your music from iTunes to Google Music via the desktop app
4) Email - Most email apps now support multiple emails via the top services.
5) Photos - Use Google Photos to have your photos backup to Google
6) Transfer Data - I used Samsung Sync to transfer my content from the iPhone to The Samsung. You have multiple options to do the transfer, direct, via and iTunes backup or and iCloud backup. I used the iTunes backup and I got over all of my text, call logs and alarms. You also have the options to move your photos, music, alarms, bookmarks and receive an app list so you know what apps you may want to re-install (App list is because iTunes apps cannot be directly installed on an Android because you need to use Google Play Store.)
There is no substitue for iMessage, but if you do switch, remember to turn off iMessage first as if not, some of your messages from you iPhone friends will disappear into text message blackhole. I also used Find My Friends for my family, but I'm not looking at a replacement that works on both iPhone and Androids. So far I'm thinking about Glymps or Life360. All in all, the switch can be done with as little headache as possible, but there will be a few trade offs.