AT&T Galaxy Note - android / imessage

[tfkohman]

a couple weeks ago, my note had to be sent out for warranty repairs...during the time it was gone, i used an old iphone 3gs...when my note came back i couldnt receive any messages from people with iphones...i could sms them, but when they tried to sms me, it went to imessage on my ipad. i did go thru the ipad and remove my phone number...and that seemed to work for all my iphone friends...except 1...so i have had her remove and relist me...i have gone to the iphone and disassociated my phone number from imessages...and when all that didnt work, i went to itunes and completely removed my iphone from my account. still no luck...and this is only this one person...any ideas on what could be causing this problem? is there something i can do?