Green vs. Blue
I have noticed that certain people I text using the iphone messages are blue and others are green. It is even with people that have iPhones! So I did a little research and discovered that if I send a message to certain people using their telephone number the text is green, however if I switch to their email address it is blue.
I further checked my phone and went to Settings>Messages>Receive At it shows my email address. That may be fine, but I went to change to receive my messages from my email to my phone number I couldn't. In fact the phone number was listed as an error (the number is correct but grey'd out).
Suggestions?
iPhone 4S, iOS 5.0.1