They can read an ID from a smart phone but the ID is different every time so not very useful in most circumstances. These RFID modules can not read contactless bank cards. It is possible to buy additional cards and tags but you should make sure they support one of those standards. Modules that use the RC522 chip should support all tags that use the following standards :
The obvious application is a security system where you use a tag to activate or deactivate an alarm but other applications include time and attendance systems and games. Both of them can be hidden inside other objects to give them a unique ID that can be read by the Pi. The contactless tags can be carried on a key-ring and the cards fit nicely in a wallet. This is potentially a great feature to include in a security system or any application where you need to identify an object or person without them pressing buttons, operating switches or other sensors. RC522 RFID modules are a simple add-on you can connect to a Raspberry Pi to read MIFARE tags and cards.
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