I have a strange problem with a customer. The customer complains that every time he calls, the called person does not hear him. If he then hangs up and calls again, then it works. He has the problem not only with one call, but with several calls with different numbers. I have not asked now exactly which numbers these are. Maybe then it would have been possible to determine if they always come from a stranger’s network.
Do you guys have any idea what this could be due to? A bad device?
We are here in Germany and use T-Mobile. (not in the city)
The customer uses an iPhone 7 with the latest iOS.
I have already spoken to T-Mobile and they said it is not a network issue.