Screen calibration

Calibrate it for what? Color? There is no way to calibrate the color, only brightness.

Define "recalibrate."

is the screen not rotating on some apps?

There is no setting for that.

Try a reset: Simultaneously hold down the Home and On buttons until the device shuts down. Ignore the off slider if it appears. Once shut down is complete, if it doesn't restart on it own, turn the device back on using the On button. In some cases it also helps to double click the Home button and close all apps BEFORE doing the reset.

iPhone and iPod touch: Troubleshooting touchscreen response

You can try resetting your iPhone by simultaneously pressing and holding the Home and Sleep/Wake buttons until you see the Apple Logo. This can take up to 15 seconds so be patient and don't release the buttons until the logo appears.

Try again to see if the problem persists.

What model phone and which version of iOS is your friends phone?