I previously had an Iphone and switched to a droid. My mom and 2 sisters have iphones. My mom's text messages come through to my phone but I can't recieve my sisters texts. I have told them to try and hold down the imessage and select send as a text message and they have deleted my phone number and entered it back in. I also have gone onto my iTunes account and deleted my iphone off of it. What else can I do to fix this?