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I'm now on latest A7, and I can't find any problems with dropped calls with neither A6 nor A7. I've done the updates since last A6 using OTA methjod (not to lose settings) and no problems. However, to rule out some bad setting, you could make a clean flash of latest A7 (wiping all) using SPFT (and perhaps try last A6 version again, to see if it's still better).
When it comes to voice calls, I'm really not much to use as a measure, since calling is the least I do with my phone, but like I said - Never had any dropped calls (the few I make).
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