This is one of the biggest reasons I would never go back to iphone. I found this thread because I was trying to find a way to keep my mom from texting me at 6:00 a.m. I live in a different time zone than many of my friends and family, and I'm always wanting to text them during hours of the day when they're probably sleeping. The ability to quickly send a text at a later time is so convenient and essential. I can't believe Apple hasn't implemented something so simple.