What's the problem with Bluetooth? File sharing between smartphones and computers has worked every single time for me, and it's natively build into all devices.
Apple can use bluetooth for file sharing. It's part of their 'Airdrop' feature, which uses bluetooth + wifi to move files around. (I think bt is only used to negotiate temporary wifi settings, and then the actual file exchange takes place over wifi.)
But once again, the real problem here is that Airdrop is apple-specific. We still have the same fundamental problem that despite having many direct file sharing choices, there is no common way across all the OS/hardware platforms.
Many southern and east European and South America countries used to have around 10%, before the last layoffs round and the broken promise to upgrade 8.1 devices to WP 10.
Can gladly provide you the link to consulting companies that sell such reports.
Until iOS came around they had absolutely excellent Bluetooth support in OS X, including file sharing and even stuff like contact sync with dumbphones which worked really well.
