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Generally, the voice MOS of GSM is about 3.0 and that of UMTS is about 3.3. Typical user complaints include unclear
voice quality, loud noises, and dropped calls. These networks consistently lag behind other advanced networks during
third-party tests. The following figure shows voice quality MOS scores in the first-tier cities worldwide, according to the
tests conducted by P3 Group, a global management consultancy firm.
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