Installing the most recent iOS version for your iPhone may be the key to resolving the issue if it is related to system issues or malware. Software upgrades also include security measures that remove any flaws or viruses that may have caused serious problems on the iPhone, such as Internet problems. Here's how to see whether your iPhone has any available OTA updates:

1. Go to the Settings tab.
2. Select General.
3. Select Software Update from the menu.
4. Select Download and Install from the menu.