I have an iPhone 5s that I bought a couple months ago -- my first iPhone. A few hours ago, I was browsing on Amazon and it begun to get very slow in loading... Then it just crashed and said safari can't work because it can't connect to the server. I have working wifi internet and working mobile data. They were on, but nothing. I couldn't even message anyone on whatsapp to ask them to look this issue up. I restarted multiple times, checked settings, turned data and wifi off and on, reset my network settings, reset all settings. I noticed if I turned wifi off and left mobile data on, it would work again. But if I turned data off and turned wifi back on, it stopped working. If I turned BOTH on, it wouldn't work either. Only with mobile data and mobile data alone. This is my main internet source as my laptop is old, slow and on it's last leg. So it is important that this work. I also don't get enough data to use for my only source; I run out and then straight talk switches me to a speed that is so slow that internet barely works -- if it does at all. Help, please?? It would be greatly appreciated.