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Being a bit more specific: I would like to know whether there's a Smartphone that can detect an RFID tag from few feet away using its original HW (no external devices) and OS capabilities. Any comment/direction to reading material will be highly appreciated.
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Active RFID systems typically operate in the ultra-high frequency (UHF) band and offer a range of up to 100 m.
Yes, you can use your phone as RFID tag. For Android or Windows phones you enable NFC. In case of an Apple you need to enable Bluetooth.
Not all phones can read a radio frequency identification tag. The handset must have a built-in Near Field Communication (NFC) device for this to be possible.
RFID is a contactless technology that can operate over a range from a few centimetres to several metres, using frequencies of 120 to 150 kHz (Low Frequency, or LF), 13.56 MHz (High Frequency, or HF) and 860 to 960 MHz (Ultra-High Frequency, or UHF).
I think the answer depends on your use of the word "RFID Tag". In the classic sense, a read-only transponder, equivalent to a bar code, the answer is not yet. There are proposals for 2.4 GHz RFID that could use existing WIFI chipsets to identify nearby objects. Nothing standard or accepted is available.
However, based on the application you describe. One potential answer may be to flip how you are thinking of setting this up. If you just need to know if a certian, unique, person is near a spot in the mall, maybe instead of their phone looking for an RFID tag you need a low cost bluetooth sniffer (connected to a low cost computing board) looking for their phone, via bluetooth MAC addresses, within say 5m. As long as the customer has bluetooth enabled, has signed up for your service and your read points are connected to the internet this approach should cover your use case.
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Basically the possibility is very low.
Near field refers the the property of RF fields with very close proximity between the devices. In the case of NFC as it applies here the devices are even closer, in what is termed the "Reactive near-field". Moving further away these properties are lost.
From Wikipedia: "Theoretical working distance with compact standard antennas: up to 20 cm (practical working distance of about 4 centimeters)"
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I just found this solution: http://www.ugrokit.com/
I don't have any experience with it.
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