So the rest of my family all have iPhones, I've never had one, and I can receive their group texts with no issues. But when I try to reply with my samsung galaxy s4 mini the message with eventually fail. If I retry sending it after turning off the wifi it works. I originally thought it was the poor reception at my house but it happens at work as well. I can send individual texts to those iPhone users with no issues. And I do have it set to auto switch between wifi and and mobile networks. This is extremely inconvenient, i should always be able to send texts no matter the phone on the other end.