iPhone 11pm randomly doesn't receive calls even with full signal. Anyone else?
I've had this issue ever since I bought my iPhone 11pm but I never really took it seriously until now. Basically, a lot of times when my friends or family call me, they get a message saying something like "the person you're trying to reach is not responding, please try again later." Meanwhile, my phone is literally on, showing full network bars, and everything looks completely normal. The weird part is that I don't even see the missed call most of the time. It's like the call never happened. Sometimes if they call a second or third time, then the phone finally rings and I can answer. Other times, nothing at all.
I honestly didn't realize this was happening because I had no idea people were trying to call me. They thought I was busy or ignoring them, while I was actually waiting for their calls. It's getting really frustrating. The phone has never been opened or repaired. Mobile data works fine, SMS works, and I don't have any other issues with it.
Has anyone else experienced something like this? Is this more likely a hardware issue or a software/carrier issue? Any idea what I should check or try before I start thinking about replacing parts? I'd really appreciate any help because this has been driving me crazy.