how can i opened my i phone which shows black screen

If your iPhone has run out of power, then you need to connect to a charger. It may take some time between the charger being connected and the phone turning on again. If your iPhone is frozen, or just showing black screen, try also doing a Forced Restart.

1. Press and quickly release Volume Up

2. Press and quickly release Volume Down

3. Press and hold the Side Button, the phone will restart. Release when you see the Apple Logo.

You can find more useful information here:

If your iPhone won't turn on or is frozen - Apple Support

See this Apple article: If your iPhone won't turn on or is frozen

If your iPhone won't turn on or is frozen - Apple Support

• If you need more help -> Contact Apple Support to set up service.