I mainly use the NFC touch transfer when my son-in-law comes to visit. (He loves technology.) We use to transfer items when we're sitting next to each other on the couch watching TV and using our phones.
You hold your devices back-to-back or close together (depending on phone or tablet) with the receiver on its homepage and the sender on the item you wish to transfer. A picture of what will transfer pops up on the sender and you click to confirm. Depending on what's being transferred, the receiving device may show a receive confirmation that they tap.
Examples of transfers:
- Looking at a web page -> tap -> other phone opens browser to that page
- Looking at a map -> tap -> other phone is looking at the same location
- Navigation directions -> tap -> other phone now has same directions
- Watching a YouTube video -> tap -> video opens on other device
- Looking at photo(s) -> tap -> transfers photo(s) to other device
- Looking at a contact -> tap -> other phone gets copy of contact
- Using an app -> tap -> other phone opens to that app in the Market
- Viewing a contact-> tap -> transfers contact to other device
It's pretty handy when you're next to someone. You don't even need to know their name, so it's an anonymous way to transfer stuff. E.g. someone stops you for directions, you could bring them up on your phone and tap to transfer. No phone number or email address is necessary.
That's for Android. I haven't tried an NFC Blackberry yet. It's up to each manufacturer as to what they can do. Most phones with NFC should at least accept basic file transfers.
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Another cool feature that Samsung has is called "All Share". Everyone in a group can enable it on their camera, and all devices share photos (via WiFi) that are taken while the feature is turned on. Pretty cool for parties.