Echos can happen under a number of situations, and even happen on landlines. There is no "fix" because its simply the nature of telecommunications. If you're on a busy cell site where you make most of your calls, you may see most of your calls echo, because there isnt enough bandwidth to encode every signal to every phone, so you end up getting back some of your own transmitted data. This is how it was explained to me several times by out in the field engineers who design build & oversee construction of cell sites. Try making calls in a different location, even 15 feet can make a difference, try to call different times of day, ask your carrier about throughput issues at nearby cell sites and sites for the person at the other end.
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