Phones need to align speaker to ear and microphone to mouth, so in that sense, there necessarily needs to be a top and bottom. I guess you can reframe the question as whether you like the jack on the microphone side or the speaker side.
Mine has decided it sometimes doesn't want to ring when people try calling. It's ringing normally on the caller's side, but I never get the call. It's a phone that's not good at being an actual phone!
I’ve had times I’m waiting for a call, with the phone in my hands directly in front of my eyes, and I’ll have a feeling something’s off so I’ll check the call log and they called a minute ago.
I suspect it’s the NSA trying to fuck with my life by ensuring I miss important calls. The arrogant bastards.