So I'm all the way up to date with all my apps/software to this date, and I wanted to use Hangouts as my main messaging app. Well, I tried that and it worked fine, but whenever I would send bigger messages my girlfriend wouldn't get them (Iphone 5, if that's relevant) and I checked to make sure everything was connected. It does this whether or not I'm on mobile data or wifi, it is really annoying too. I have delivery receipts on, and it only gives me a check mark for some of the messages, but rarely the bigger ones. I have no idea why this is happening but it sucks. Please help, thanks.