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Apple iPhone 7

Troubleshooting

If your device isn't working properly, you can try several solutions to solve the problem.
In most cases you can solve the problem by following these guidelines:

The device isn't performing optimally

Cause 2 of 6: There are too many running applications

If you've used many applications on your device, it may get slow because the applications keep running in the background.

Solution: End running applications.