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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:

Missed calls are diverted to your COMBOX® (or another number) after a set number of seconds. If the time limit is set to the lowest number of seconds, it may be difficult to answer the call in time.

Solution: Select a longer time interval for diverting missed calls.