When I am at home using WiFi, I can upload photos and share with multiple people at the same time. However I can't get it to work on cellular data connection when I am away from home. In fact I think I have not been able to send photos to another single person while I'm working away from my house. The photo goes into sending mode for a long time. Finally I get a FAILED result. I retry several times, but always fails. After I return home to WiFi, I'm able to send all the photos from my phone.