So my GF's Samsung S5 is having a few problems, she's with AT&T.
Basically, around half the time I send her picture messages she doesn't get them and instead gets a little box as if its a bad link on the internet. This happens whether its through groupme, dropbox, screenshots, pictures taken as text attachments or pictures taken with the phone. She uses the default messaging app.
She also is now telling me that she sent her friend a picture and that friend didn't receive it until days later.
Another tiny issue shes having is she has to re-enter her HOME wi-fi password once in a while with the phone as if its not always remembering or saving it. I'm not sure if this is happening only after a restart or not. She's just telling me about this and I haven't had the chance to really check it or play with it because she has unlimited 4G and usually its not even noticed.
She's had a metric ton of problems switching from an iPhone to a Samsung due to iMessage and was for several months not getting any texts from iphone users, we think that has been solved but I feel like its still somehow related. Seriously fuck iMessage, we went through so many solutions and trips to the apple store to fix it (if its even fixed). Next step is changing her number/carrier (which I'd love for her to do anyway).