You're saying it's only Iphones but some Iphones are OK? If so, this usually is caused by settings on the iPhone side. Having SMS, MMS, and iMessage makes IPhones act strange at times.
Please back up all of your message and try the following:
Go to Setting --> Applications--> Select Messages --> Go to Storage --> Clear out the Cache and Data memory
If issue persists, please send us an error report with screenshots from One UI Beta App (Beta Feedback -> Send feedback-> Error Reports -> "Select Category" -> Input frequency and Description" -> Send (Top Right Icon). We appreciate your help for supporting beta program.
Just a question... You can not send text to a certain number all the time or just some times? Sister-in-law has iPhone and messages get lost several times but not all the time. Not just on 10, but also on 9ect.....
