how can I reset my phone, it keeps on turning off
my phone keep on turning off and it doesn’t let me open any apps
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It may be time for a new battery.
Batteries degrade over time with usage, that's just how they work.
You can expect about a 1% drop per month with average use on an iPhone.
Apple recommends replacing it when it reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.
iPhone Battery Replacement.
iPhone Battery Repair & Replacement - Apple Support
About Lithium Ion Batteries
iPhone Battery and Performance - Apple Support (IN)