They are not one and the same. The market can grew therefore your sales can increase while you lose market share.
Your mistake is that you are both arguing the same point but saying the other is wrong, you are both talking about before the announcement of Symbian being killed.
Where market share was dropping but sales WERE increasing and higher than ever. This is GrimyHRs point. Therefore your "sell less" examples are wrong because they were not selling less at the time.
Nokia ... 77.3 million phones shipped and a 15.7% share of the market in 2011, down from 100.1 million phones shipped in 2010 for a 32.9% market share.