So I have no idea what to do or where to turn about this issue. I have an iPhone 6s Plus with iOS 11.2.5. It was manufactured for AT&T, but it's been unlocked and I have Straight Talk service. For about a month, everything was fine. It worked perfectly. However, this month, it went from extremely limited connectivity on data to absolutely none at all. When I try to load something on data, it says I am not connected to the internet. I've contacted my carrier service and they have been no help. They've sent me links to download the APN settings, but for the att.mvno, it said that the UUID was not unique. Then for the wap.tracfone, it said only one APN configuration could be installed at a time. However, it doesn't even show an APN configuration listed. I've tried turning the data off and on, tried turning airplane mode off and on, tried restarting multiple times, soft reset, hard reset, resetting network settings. I've tried everything I can think of and everything anyone has suggested to me and nothing has worked. Does anyone have any idea what the issue is and/or how to fix it? I don't have the money to get a new phone or switch service providers. There's got to be a way to fix this, somehow. Every problem has a solution. I just don't even know what the problem is. Any help would be appreciated.