I had this exact same issue and there is one more step to guarantee that you will receive all texts from your remaining iPhone friends.
-Anyone who has you in their iPhone contacts must manually go into their contacts and change your number from listed as an iPhone to Mobile
If not their phone will always try to push their messages to you through the iMessage servers first and will eventually fail to send. I spent an hour with an Apple tech and while she did have to remove my phone number from the server she also informed me that I needed to contact all my iPhone buddies and have them change my contact.
What a pain in the a**. Why did they have you on the phone for so long? The guy I spoke to had it done in pretty short order. But yes, I do plan to have all my iPhone contacts update me in their address book. Now I wish I had known about this before I deactivated my iPhone.
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