I'm new to smartphones and sparing what time I can to climb the steep learning curve. Any helpful info about the problem I'm experiencing will be appreciated! I'm running an app to process credit card charges. The location I run charges from has not changed. My carrier is Sprint. The data plan has not changed. When I had an iphone, the app worked speedily with never a failed transaction. But I didn't care for other aspects of that phone, so I switched to this Samsung. Now, the app is slow: I often have to sign in twice because the first one doesn't go through, and processing is noticeably slower and even times out about 30% of the time. Since everything else is the same, I'm thinking it's the hardware, and I'll need to go back to the iphone for trouble-free running of this app. Please share your experience/knowledge--TIA!