iPhone to Android iMessage bug fix
I was having the problem when i switched from my iPhone to my Galaxy s4 where people using iPhones would try to text me and it wouldn't get to me because it would be sent in iMessage. Well i asked one of my friends who knows a lot about Apple products and he seems to have found a fix. What worked for me is to open iTunes, then go to account. Once there find the the section "iTunes in the cloud" and the option in there "Manage my devices". You have to go in there and remove your iPhone from the iCloud and that should work, or at least it did for me.