Google is activating half a million Android devices a day, a big jump in just the last couple months, a sign of growing momentum for the platform. While SymbianOS appears to be hanging on in the mobile arena, trends indicate that the iOS share is slipping slightly, losing ground to Android. The pure marketshare numbers don’t tell the whole story, since the entire segment is growing rapidly, so even platforms that are in declining share might be adding new users. But if the upsurge in Android activations continues, Android may overtake iOS in a few months and move into second place behind SymbianOS. Blackberry is in a slow decline, while WP7 does not have enough market share to appear in the statistics.