my texts and calls are not being received
My daughter's iPhone 5 and my son's iPhone 6 don't receive my calls or texts all of a sudden. Everyone else is. I have an iPhone 5S and we all have AT&T. When I call my son, it goes straight to voicemai. When I call my daughter, it rings once then goes to voicemail. When I text either of them, my texts says "Delivered". Any help would be appreciated!