iphone 11 pro max just won't play my videos

Hello debraj1976 and welcome to Apple Support Communities.

I see you are having issues playing videos on your iPhone. You've only said that the device will not play videos from a number of source, not what happens when you try.

Assuming you are using the iCloud Photos service on that device and that the option to Optimize iPhone Storage is selected, the the one commonality in all of the video source you name would be something regarding the network. Try this:

1) Reboot the router. This is a key step with this kind of issue even if other devices are not having an issue connecting.

2) Follow the steps here to forget the network on your iPhone and then reconnect to it.

How to forget a Wi-Fi network on your iPhone, iPad, iPod touch, or Mac - Apple Support

Cheers.

Hi Starr,

Thanks for taking out your precious time for reading my problem and trying to provide me a solution. As suggested by you, I tried both the options provided and it still did not work. Even I recorded a short video of 20 secs duration with the iphone with both the front facing and rear facing camera, but I could not play back these videos. Though the videos show the duration as -00:19, it won't play back these videos. A still photo of the first frame is only displayed.

Other issue that I face, is though i can place the calls, I can't hear anything from the other person, nor can the other person hear anything from me, though I see duration of calls. I verified this with placing calls to my wife in the other room ! Also, I switched to a different working SIM card to eliminate the issue of SIM issue. Same with wifi calling.

Luckily, I can use my old android phone to make/place calls.

Steps that I followed before :

1. Restarted the iphone - it didn't work. same issue persisted.
2. Reset Network Settings -it didn't work. same issue persisted.
3. Reset All Settings - it didn't work. same issue persisted.
4. Did a DFU Restore - it didn't work. same issue persisted.
5. Did a DFU Restore without backup from my icloud. - This was done to eliminate the possibility of some app or my data interfering with the operation. Still it does not play back videos or can't make regular calls.

I contacted Apple Customer service and they sent me a repair request. I thank you again for trying to help me out in these challenging times .

Thanks,

Debraj