How physically close will a tag need to be for the phone to detect a NFC card? (10cm or can it greater)
Also can the phone present itself as a NFC tag to other phones? If this is possible is the range greater as the NFC transmitter is powered?
Answer
How physically close will a tag need to be for the phone to detect a NFC card? (10cm or can it greater)
NFC is intentionally very low ranged since it is meant to be difficult to accidentally connect to the wrong NFC readers. One of its possible applications is to aid in initiating longer-ranged connection (e.g. Bluetooth or Wifi) with zero configuration.
Also can the phone present itself as a NFC tag to other phones? If this is possible is the range greater as the NFC transmitter is powered?
There are plans for future Android releases to support NFC card emulation, but Nexus S won't be getting it since it lacks the necessary hardware. I can think of several ways to hack around this, with some limitations, since static NFC tag can be made as a sticker, but full NFC card emulation will not be available in Nexus S.
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