for iphone my control center will not swipe up from the bottom...it's gone

iPhone SE, iPhone 8 and earlier, and iPod touch

• To open Control Center, swipe up from the bottom edge of any screen. 
• To close Control Center, tap the top of the screen or press the Home button.

If it is not working:

Try a restart.

Still not working:

Contact Apple Support

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Access Control Center on your iPhone and iPod touch - Apple Support

iPhone X and later

• To open Control Center, swipe down from the top-right corner of your screen.