Just made the switch from iPhone 4 to Galaxy S4, and I'm loving Android. Unfortunately, I had an initial problem with receiving messages from people who I had previously conversed with via iMessage. Even after disabling the iMessage feature on my deactivated iPhone and Macbook Pro, I was still unable to receive a message from a person I previously iMessaged. After disassociating everything (i.e. accounts, program, iCloud, etc...), and also troubleshooting with AT&T and Apple at their stores, the problem seemed to fix itself over the time period. Looks like this an odd and unexpected problem that people experience when switching phones. I went over all the
steps users used (including over the phone with Apple), but for me, it seems like the problem took a while to clear in Apple's ecosystem after completing these various steps.
At the moment, much happier being more invested in the Google Atmosphere. Absolutely loving the S4, and I have been having a blast learning to navigate the Android landscape.