Advanced Calling is still spotty in my area...I won't use it until its a full rollout. Anything less isn't worth the frustration of consistently dropped calls...
I am in Southern California. When it first went live, I did have frequent call drops. However, in our area for the last 3 months at least, it has been rock solid with only the very rare dropped call. The sound quality is much better when calling another phone with Advanced Calling. With iPhone, it is great having voice and data at the same time.
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