The showstoppers at the moment in my opinion are the following:
1. Connection Stability (switching between WiFi/Mobile Data *needs* to be reliable) this includes the deep sleep behaviour which can have side effects like not getting notifications reliably in the backround while the phone is idle for too long.
2. Contacts mass export/import and general management
3. Voicemail notifications
4. Better navigation [preferrrably with offline options]
4. IMAP/IDLE support
5. Enterprise WiFi support
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