Some modems just don't sound very good, I think it's just that sure of them don't really do well with the audio hardware, or different bands are being used. They probably are carrier designed, but many carriers share the same frequencies. A modem from a different carrier could even work better for you. You can monitor/change the frequencies by using service mode. It should be *#*#0011#*#* to view current status, and *#*#2263#*#* for band selection
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