If your iPhone screen is black or frozen, follow the specific steps for your device model. If you have an iPhone 8 and later, press and release vol. up then volume down then hold side button until Apple logo appears. For iPhone 7 and 7 Plus, press and hold side and volume down buttons until you see the Apple logo. For iPhone 6s and earlier, press and hold Home and side/top buttons until Apple logo. If phone still doesn't turn on after charging, you may need to speak with someone at a genius bar in an Apple Store. (source: https://support.apple.com/en-us/HT201412)
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