If your iPhone 15 displays a lightning bolt icon even when it's not connected to a charger, it may indicate a software glitch or a hardware issue. To address this, consider the following steps:
Restart Your iPhone: A simple restart can resolve minor software glitches.
Update iOS: Ensure your device is running the latest version of iOS, as updates often contain bug fixes.
Check for Moisture or Debris: Inspect the charging port for any moisture or debris that might cause false charging indicators.
Reset All Settings: If the issue persists, resetting all settings can help. Navigate to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings.
If none of these steps resolve the problem, it's advisable to contact Apple Support or visit an Apple Authorized Service Provider for further assistance.