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Thanks for posting in the Apple Support Communities Ghigs,

As mentioned in the following resource: Rotate the screen on your iPhone or iPod touch

Some apps don't support rotation, so your screen might not rotate even if Portrait Orientation Lock isn't turned on.

The following steps may help:

Rotate the screen on an iPhone without a Home button

1: Swipe down from the top-right corner of your screen to open Control Center.

2: Tap the Portrait Orientation Lock button  to make sure that it's off.

3: Turn your iPhone sideways.

If the screen still doesn't rotate, try a different app — like Safari or Messages — which are known to work in landscape mode.

Learn how to rotate the screen on your iPad.

Cheers!