I am an iOS user that just switched to a Note 3. I was not receiving group texts or individual texts from my iphone friends. I have 2 iPhones, and 2 ipads. The definitive reason I had texting issues is that I had multiple iOS devices that used iMessaging with the same appleID connected to my cell number, and email address (appleID). All your iphone friends will have your phone number "saved" as an iMessage contact as default. This is the root of the problem. You are still being detected/remembered as an iMessage user by their phones. iMessage is so integrated into iOS that it is difficult to unravel it. After reading a few threads I pieced together how to get rid of iMessage easily.
1) Apple ID is stored in two places: App Store and iMessage separately, log out of both on ALL iOS devices in settings>app store and settings>iMessage.
2) log in to https://appleid.apple.com and change your AppleID to a NEW email address
3) remove your cell phone number from the apple ID
4) log back into all iOS devices using new AppleID and deselect the cell phone number and old appleID email address. check the new email address (New AppleID)
5) Once you do this on all devices your texting will resume to normal. Remember iMessage can be used with email address or phone number that why it is important to get rid of all devices. Leaving just one will screw it up.
6) Once all devices are logged into the app store and iMessage under the new AppleID texting should resume normally.
Make sure you remember to log out of your itunes account and appleTV too.
1) Apple ID is stored in two places: App Store and iMessage separately, log out of both on ALL iOS devices in settings>app store and settings>iMessage.
2) log in to https://appleid.apple.com and change your AppleID to a NEW email address
3) remove your cell phone number from the apple ID
4) log back into all iOS devices using new AppleID and deselect the cell phone number and old appleID email address. check the new email address (New AppleID)
5) Once you do this on all devices your texting will resume to normal. Remember iMessage can be used with email address or phone number that why it is important to get rid of all devices. Leaving just one will screw it up.
6) Once all devices are logged into the app store and iMessage under the new AppleID texting should resume normally.
Make sure you remember to log out of your itunes account and appleTV too.