iPhone dropped from the top on my Desktop

I have a desktop that I put on the floor. I put my iPhone on top of the desktop, and accidentally I stumbled on the desktop and the phone dropped to the floor.

When I picked it up the screen was OK, the phone was still functioning as normal. And it appeared as if it never dropped. But what I worried is that it may suffer internal damage that I can't see from the surface.

Is my fear warranted?

The inside of an iPhone is all solid state and can tolerate being dropped. That said, you should thoroughly test the hardware on your phone to see if anything broke. This includes the screen, case, the touchscreen (make sure that touch and multitouch still works everywhere), the headphone jack, all the buttons, the camera and flash, and the dock connector. A bump could have misaligned or disconnected any of the above hardware.

Honestly my phone started acting up now and I've had it since they came out . I love my phone and I've had this bad habit of laying it my lap and forgetting about it as I get out of my truck . I've done this at least 10 times and it still functions properly

All I have to say is as dainty as I thought this phone would be it survived even my rugged harsh lifestyle.

And the thing I respect about it is that at least it breaks down bit by bit instead of leaving you with a brick after the first fall