is it true if you have ATT.. advanced messaging on GALAXY will only work between fellow ATT carriers .. i do not get any text receipts from any friends on verizon.. OR does it have to be the newer galaxy phones only that send receipts? ATT couldnt even answer this. i also hate using whatsapp to receive text receipts from iphone users! (i am addicted to message receipts)
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I don't know about at&t but I can tell you that any time I am using certain features on text messaging on my phone (T-mobile) they are only applicable when communicating with other T-Mobile users. Similarly if I use advance features while calling (ex:video calling) they are only applicable when talkiing to other people on my network.
I know there were global standards for such things as video calling that would allow iinteroperability between carries. But the USA carriers don't tent to implement these opting for their own (carrier specific) implementations instead.